build checks.x86_64-linux.cProjectModule

Reproduce this run
  1. 0.17 s $ /nix/store/vzx1mi9c0xfadmsm9dhd83d005cb1qs9-coreutils-9.8/bin/timeout --kill-after=15s 1800s /nix/store/99b1z08awpxj8b6mzggn59gp1shljnff-nix-2.34.5/bin/nix --extra-experimental-features nix-command --extra-experimental-features flakes --log-format internal-json build --no-link git+https://github.com/sellout/flaky?ref=cascading-direnv&rev=83ff865e71a3474f91559901645766157bdba14c#checks.x86_64-linux.cProjectModule --print-build-logs
  2. 0.20 s warning: ignoring untrusted flake configuration setting 'allow-import-from-derivation'.
  3. 0.20 s Pass '--accept-flake-config' to trust it
  4. 0.20 s warning: ignoring untrusted flake configuration setting 'extra-experimental-features'.
  5. 0.20 s Pass '--accept-flake-config' to trust it
  6. 0.20 s warning: ignoring untrusted flake configuration setting 'extra-substituters'.
  7. 0.20 s Pass '--accept-flake-config' to trust it
  8. 0.20 s warning: ignoring untrusted flake configuration setting 'extra-trusted-public-keys'.
  9. 0.20 s Pass '--accept-flake-config' to trust it
  10. 0.20 s warning: ignoring untrusted flake configuration setting 'sandbox'.
  11. 0.20 s Pass '--accept-flake-config' to trust it
  12. 0.20 s warning: ignoring untrusted flake configuration setting 'use-registries'.
  13. 0.20 s Pass '--accept-flake-config' to trust it
  14. 0.20 s error (ignored): SQLite database '/var/cache/private/nix-ci-worker/eval-cache-v6/b974724651d0c8acd50e072b631e94dbac109987d1dfe3a666ceca8adae05197.sqlite' is busy
  15. 3.01 s
  16. 7.28 s Waiting for lock on waiting for lock on '/nix/store/a77bp5lj5wa00zk464bwiv4x6qjddg11-link'
  17. 7.28 s Waiting for lock on waiting for lock on '/nix/store/pxyqzdwrnyksazdk1881ij6f66irqvjd-pm_.editorconfig'
  18. 7.32 s Waiting for lock on waiting for lock on '/nix/store/0v1l6cjciqwvawiv553mmkxj1lfrjhg0-pm_.envrc'
  19. 7.32 s Waiting for lock on waiting for lock on '/nix/store/gdrj5lv1g9y3wah6s1ifjza0qrhn1ndh-pm_.githubrenovate.json'
  20. 7.32 s Waiting for lock on waiting for lock on '/nix/store/wyaql5r6prrhfs3hznsf03ab9k8y9bjl-pm_.githubsettings.yml'
  21. 7.32 s Waiting for lock on waiting for lock on '/nix/store/gnhvh7kl3my6bd3ad41xjl5h13h7fa5d-pm_.gitignore'
  22. 7.32 s Waiting for lock on waiting for lock on '/nix/store/zkww6f6abn7pyjrv0ga3lynkjy4n587d-pm_.vale.ini'
  23. 7.32 s Waiting for lock on waiting for lock on '/nix/store/4dhspz0j60qa5vsszxigh99m2ppz2ykm-pm_flakehubpublish.yml'
  24. 7.32 s Waiting for lock on waiting for lock on '/nix/store/3i33gb1kggarin5sv9fma4ggvk4m9z4r-pm_flakestrypublish.yml'
  25. 7.32 s Waiting for lock on waiting for lock on '/nix/store/ykr09w75mv2q0l0yv1j250dqjs2rnh88-pm_garnix.yaml'
  26. 7.32 s Waiting for lock on waiting for lock on '/nix/store/xs5jkhxcwi84bkhcvyw5n60xm4a6ix74-pm_gitconfig'
  27. 7.32 s Waiting for lock on waiting for lock on '/nix/store/cpkjrimwnx6afikvcwjshvdqkzdlv15z-pm_githooksprepush'
  28. 7.32 s Waiting for lock on waiting for lock on '/nix/store/hsk6nkfr5smv1sfq9999ai19jszfdp87-pm_gitignoreRevs'
  29. 7.32 s Waiting for lock on waiting for lock on '/nix/store/4i70r9jy90w0hd9krcawdys9cg4bhmsj-pm_nixci.nix'
  30. 7.32 s Waiting for lock on waiting for lock on '/nix/store/41q4wxjfjbhiqfi9krw6h3v7sjg3m18f-pm_switchpmgeneration.yml'
  31. 7.32 s Building cleanup
  32. 7.33 s Building pm_.cachevaleVocabflakyaccept.txt
  33. 7.36 s Building pm_.cachevaleconfigvocabulariesflakyaccept.txt
  34. 7.37 s Building pm_.clangformat
  35. 7.41 s Building pm_.gitattributes
  36. 7.46 s Building updateStatus
  37. 7.46 s Downloading cached compiler-rt-libc from https://cache.nix-ci.com
  38. 7.46 s Downloading cached expand-response-params from https://cache.nix-ci.com
  39. 7.46 s Downloading cached llvm-21.1.7-lib from https://cache.nix-ci.com
  40. 7.48 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/cwv2wv6cfnrsmlkx3wh6s6c15yvi7naq-cleanup
  41. 8.06 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  42. 8.07 s [post-build-hook] Uploading to the NixCI cache: /nix/store/cwv2wv6cfnrsmlkx3wh6s6c15yvi7naq-cleanup
  43. 8.12 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  44. 8.22 s [post-build-hook] copying 0 paths...
  45. 8.28 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  46. 8.42 s [post-build-hook] copying 0 paths...
  47. 8.43 s Progress: 1 of 29 built (5 building), 0 of 10 downloaded from cache (3 downloading)
  48. 8.45 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/i47w8iafpil7wxbj4mrzdgj080kc58cx-pm_.cachevaleVocabflakyaccept.txt
  49. 9.20 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  50. 9.21 s [post-build-hook] Uploading to the NixCI cache: /nix/store/i47w8iafpil7wxbj4mrzdgj080kc58cx-pm_.cachevaleVocabflakyaccept.txt
  51. 9.25 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  52. 9.46 s [post-build-hook] copying 1 paths...
  53. 9.46 s [post-build-hook] copying path '/nix/store/i47w8iafpil7wxbj4mrzdgj080kc58cx-pm_.cachevaleVocabflakyaccept.txt' to 'https://cache.nix-ci.com'...
  54. 9.57 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  55. 9.68 s [post-build-hook] copying 0 paths...
  56. 9.69 s Progress: 2 of 30 built (4 building), 0 of 10 downloaded from cache (3 downloading)
  57. 9.71 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/lwc48y7qhhnb1xd2f6c44mql93yi56fi-pm_.cachevaleconfigvocabulariesflakyaccept.txt
  58. 10.16 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  59. 10.18 s [post-build-hook] Uploading to the NixCI cache: /nix/store/lwc48y7qhhnb1xd2f6c44mql93yi56fi-pm_.cachevaleconfigvocabulariesflakyaccept.txt
  60. 10.22 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  61. 10.80 s [post-build-hook] copying 1 paths...
  62. 10.80 s [post-build-hook] copying path '/nix/store/lwc48y7qhhnb1xd2f6c44mql93yi56fi-pm_.cachevaleconfigvocabulariesflakyaccept.txt' to 'https://cache.nix-ci.com'...
  63. 10.91 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  64. 11.02 s [post-build-hook] copying 0 paths...
  65. 11.03 s Progress: 3 of 31 built (3 building), 0 of 10 downloaded from cache (3 downloading)
  66. 11.05 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/dncxpnx04zz1m067qqpjvaws98jyb7rz-pm_.clangformat
  67. 11.47 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  68. 11.49 s [post-build-hook] Uploading to the NixCI cache: /nix/store/dncxpnx04zz1m067qqpjvaws98jyb7rz-pm_.clangformat
  69. 11.53 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  70. 11.73 s [post-build-hook] copying 1 paths...
  71. 11.73 s [post-build-hook] copying path '/nix/store/dncxpnx04zz1m067qqpjvaws98jyb7rz-pm_.clangformat' to 'https://cache.nix-ci.com'...
  72. 11.84 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  73. 11.94 s [post-build-hook] copying 0 paths...
  74. 11.95 s Progress: 4 of 32 built (2 building), 0 of 10 downloaded from cache (3 downloading)
  75. 11.96 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/903lpbppc1vmagy8brhcwsax5sl2ski7-pm_.gitattributes
  76. 12.44 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  77. 12.47 s [post-build-hook] Uploading to the NixCI cache: /nix/store/903lpbppc1vmagy8brhcwsax5sl2ski7-pm_.gitattributes
  78. 12.54 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  79. 12.75 s [post-build-hook] copying 1 paths...
  80. 12.75 s [post-build-hook] copying path '/nix/store/903lpbppc1vmagy8brhcwsax5sl2ski7-pm_.gitattributes' to 'https://cache.nix-ci.com'...
  81. 12.90 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  82. 13.01 s [post-build-hook] copying 0 paths...
  83. 13.03 s Progress: 5 of 33 built (1 building), 0 of 10 downloaded from cache (3 downloading)
  84. 13.03 s Progress: 5 of 28 built (1 building), 1 of 10 downloaded from cache (2 downloading)
  85. 13.03 s Progress: 5 of 28 built (1 building), 2 of 10 downloaded from cache (1 downloading)
  86. 13.03 s Progress: 5 of 28 built (1 building), 3 of 10 downloaded from cache
  87. 13.05 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/63wcid2xa85n4pi91d3zkb0qy1zdsk8r-updateStatus
  88. 13.51 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  89. 13.54 s [post-build-hook] Uploading to the NixCI cache: /nix/store/63wcid2xa85n4pi91d3zkb0qy1zdsk8r-updateStatus
  90. 13.59 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  91. 13.69 s [post-build-hook] copying 0 paths...
  92. 13.76 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  93. 13.94 s [post-build-hook] copying 0 paths...
  94. 13.96 s Progress: 6 of 29 built, 3 of 10 downloaded from cache
  95. 13.99 s Building pm_nixci.nix
  96. 13.99 s Downloading cached binutils-wrapper from https://cache.nix-ci.com
  97. 13.99 s Downloading cached clang-21.1.7-lib from https://cache.nix-ci.com
  98. 13.99 s Downloading cached compiler-rt-libc-21.1.7-dev from https://cache.nix-ci.com
  99. 14.04 s Progress: 6 of 26 built (1 building), 4 of 10 downloaded from cache (2 downloading)
  100. 14.05 s Progress: 6 of 26 built (1 building), 5 of 10 downloaded from cache (1 downloading)
  101. 14.07 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/4i70r9jy90w0hd9krcawdys9cg4bhmsj-pm_nixci.nix
  102. 14.54 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  103. 14.55 s [post-build-hook] Uploading to the NixCI cache: /nix/store/4i70r9jy90w0hd9krcawdys9cg4bhmsj-pm_nixci.nix
  104. 14.60 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  105. 14.80 s [post-build-hook] copying 1 paths...
  106. 14.80 s [post-build-hook] copying path '/nix/store/4i70r9jy90w0hd9krcawdys9cg4bhmsj-pm_nixci.nix' to 'https://cache.nix-ci.com'...
  107. 14.93 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  108. 15.02 s [post-build-hook] copying 0 paths...
  109. 15.03 s Progress: 7 of 27 built, 5 of 10 downloaded from cache (1 downloading)
  110. 17.59 s Progress: 7 of 26 built, 6 of 10 downloaded from cache
  111. 17.60 s Downloading cached clang from https://cache.nix-ci.com
  112. 18.07 s Progress: 7 of 26 built, 7 of 10 downloaded from cache
  113. 18.07 s Downloading cached clang-wrapper from https://cache.nix-ci.com
  114. 18.21 s Progress: 7 of 22 built, 8 of 10 downloaded from cache
  115. 18.21 s Downloading cached clang-tools from https://cache.nix-ci.com
  116. 18.35 s Progress: 7 of 22 built, 9 of 10 downloaded from cache
  117. 18.35 s Downloading cached treefmt.toml from https://cache.nix-ci.com
  118. 18.38 s Progress: 7 of 22 built, 10 of 10 downloaded from cache
  119. 18.41 s Building treefmt
  120. 18.48 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/rl56n4kwsvr7i6j61cjzgs9gmkyv4d93-treefmt
  121. 18.92 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  122. 18.95 s [post-build-hook] Uploading to the NixCI cache: /nix/store/rl56n4kwsvr7i6j61cjzgs9gmkyv4d93-treefmt
  123. 19.01 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  124. 19.11 s [post-build-hook] copying 0 paths...
  125. 19.16 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  126. 19.31 s [post-build-hook] copying 0 paths...
  127. 19.32 s Progress: 8 of 22 built, 10 of 10 downloaded from cache
  128. 19.35 s Building pm-session-vars.sh
  129. 19.42 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/g524dkh2xmkkzjc51y7qi796dhykvakg-pm-session-vars.sh
  130. 19.87 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  131. 19.89 s [post-build-hook] Uploading to the NixCI cache: /nix/store/g524dkh2xmkkzjc51y7qi796dhykvakg-pm-session-vars.sh
  132. 19.94 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  133. 20.03 s [post-build-hook] copying 0 paths...
  134. 20.08 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  135. 20.22 s [post-build-hook] copying 0 paths...
  136. 20.24 s Progress: 9 of 22 built, 10 of 10 downloaded from cache
  137. 20.30 s Building project-manager-path-for-flaky
  138. 20.38 s [project-manager-path-for-flaky] created 207 symlinks in user environment
  139. 20.43 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/a39izq15bq5hgn9mnxjbsahx8kic8clx-project-manager-path-for-flaky
  140. 20.94 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  141. 20.95 s [post-build-hook] Uploading to the NixCI cache: /nix/store/a39izq15bq5hgn9mnxjbsahx8kic8clx-project-manager-path-for-flaky
  142. 20.99 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  143. 21.09 s [post-build-hook] copying 0 paths...
  144. 21.15 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  145. 21.43 s [post-build-hook] copying 1 paths...
  146. 21.44 s [post-build-hook] copying path '/nix/store/8dgc1bwv8dr3pzipv30wgqz3999q702m-project-manager-path-for-flaky.drv' to 'https://cache.nix-ci.com'...
  147. 21.69 s Progress: 10 of 22 built, 10 of 10 downloaded from cache
  148. 23.74 s Building activation-script
  149. 23.82 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/8wjbf0fiwg2mdp8wy2v45cw1z3jvfnvq-activation-script
  150. 24.26 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  151. 24.29 s [post-build-hook] Uploading to the NixCI cache: /nix/store/8wjbf0fiwg2mdp8wy2v45cw1z3jvfnvq-activation-script
  152. 24.35 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  153. 24.56 s [post-build-hook] copying 1 paths...
  154. 24.56 s [post-build-hook] copying path '/nix/store/8wjbf0fiwg2mdp8wy2v45cw1z3jvfnvq-activation-script' to 'https://cache.nix-ci.com'...
  155. 24.85 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  156. 25.21 s [post-build-hook] copying 1 paths...
  157. 25.21 s [post-build-hook] copying path '/nix/store/v82craml7n32rdhvd9nfjfpwgh5p21aa-activation-script.drv' to 'https://cache.nix-ci.com'...
  158. 25.45 s Progress: 11 of 15 built, 10 of 10 downloaded from cache
  159. 29.49 s Building project-manager-files-for-flaky
  160. 29.66 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/16xm0npkyvimi9z36y8kdsnc2grk2vgg-project-manager-files-for-flaky
  161. 30.11 s [post-build-hook] Pushing 1 paths (19 are already present) using zstd to cache sellout ⏳
  162. 30.11 s [post-build-hook]
  163. 30.82 s [post-build-hook] Pushing /nix/store/16xm0npkyvimi9z36y8kdsnc2grk2vgg-project-manager-files-for-flaky (8.33 KiB)
  164. 31.86 s [post-build-hook]
  165. 31.86 s [post-build-hook] All done.
  166. 31.88 s [post-build-hook] Uploading to the NixCI cache: /nix/store/16xm0npkyvimi9z36y8kdsnc2grk2vgg-project-manager-files-for-flaky
  167. 31.95 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  168. 32.22 s [post-build-hook] copying 1 paths...
  169. 32.22 s [post-build-hook] copying path '/nix/store/16xm0npkyvimi9z36y8kdsnc2grk2vgg-project-manager-files-for-flaky' to 'https://cache.nix-ci.com'...
  170. 32.93 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  171. 33.17 s [post-build-hook] copying 1 paths...
  172. 33.17 s [post-build-hook] copying path '/nix/store/5ddfxh3gh8gshnhx6kzya5f6sx8g2vxw-project-manager-files-for-flaky.drv' to 'https://cache.nix-ci.com'...
  173. 33.41 s Progress: 12 of 14 built, 10 of 10 downloaded from cache
  174. 33.47 s Building project-manager-generation-for-flaky
  175. 33.58 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/lmfqdnc59xbw1h8qah92yw109x18qyca-project-manager-generation-for-flaky
  176. 34.28 s [post-build-hook] Pushing 2 paths (220 are already present) using zstd to cache sellout ⏳
  177. 34.28 s [post-build-hook]
  178. 34.66 s [post-build-hook] Pushing /nix/store/7g20i5qwsw7h4wf7fxp79yw8c5cg3b7a-perl5.40.0-libnet-3.15 (210.99 KiB)
  179. 34.78 s [post-build-hook] Pushing /nix/store/lmfqdnc59xbw1h8qah92yw109x18qyca-project-manager-generation-for-flaky (9.98 KiB)
  180. 35.89 s [post-build-hook]
  181. 35.89 s [post-build-hook] All done.
  182. 35.91 s [post-build-hook] Uploading to the NixCI cache: /nix/store/lmfqdnc59xbw1h8qah92yw109x18qyca-project-manager-generation-for-flaky
  183. 35.98 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  184. 36.01 s [post-build-hook] copying 1 paths...
  185. 36.01 s [post-build-hook] copying path '/nix/store/lmfqdnc59xbw1h8qah92yw109x18qyca-project-manager-generation-for-flaky' to 'https://cache.nix-ci.com'...
  186. 36.47 s [post-build-hook] warning: 'warn-short-path-literals' is deprecated, use 'lint-short-path-literals = ignore' instead
  187. 36.86 s [post-build-hook] copying 1 paths...
  188. 36.86 s [post-build-hook] copying path '/nix/store/wpqjd8d32ymc1pa60lslm38svfvmi220-project-manager-generation-for-flaky.drv' to 'https://cache.nix-ci.com'...
  189. 37.10 s Progress: 13 of 14 built, 10 of 10 downloaded from cache
More Logs Raw Logs

Agent Instructions

Wait for completion, without logs:

curl --netrc -N https://nix-ci.com/gh:sellout:flaky/cascading-direnv/83ff865e71a3474f91559901645766157bdba14c/c9dbe490-9342-4f0d-84b0-5ca84aecbe84/wait

Latest logs, with timestamps (streams while running):

curl --netrc -N https://nix-ci.com/gh:sellout:flaky/cascading-direnv/83ff865e71a3474f91559901645766157bdba14c/c9dbe490-9342-4f0d-84b0-5ca84aecbe84/tail

All logs, with timestamps (available after completion):

curl --netrc https://nix-ci.com/gh:sellout:flaky/cascading-direnv/83ff865e71a3474f91559901645766157bdba14c/c9dbe490-9342-4f0d-84b0-5ca84aecbe84/logs

Raw logs, from the start (no timestamps):

curl --netrc -N https://nix-ci.com/gh:sellout:flaky/cascading-direnv/83ff865e71a3474f91559901645766157bdba14c/c9dbe490-9342-4f0d-84b0-5ca84aecbe84/raw-logs

Content types available for /logs and /tail (use Accept header):

Example:

curl --netrc -H "Accept: text/csv" https://nix-ci.com/gh:sellout:flaky/cascading-direnv/83ff865e71a3474f91559901645766157bdba14c/c9dbe490-9342-4f0d-84b0-5ca84aecbe84/logs

Reproduce locally: https://nix-ci.com/gh:sellout:flaky/cascading-direnv/83ff865e71a3474f91559901645766157bdba14c/c9dbe490-9342-4f0d-84b0-5ca84aecbe84/repro

For more instructions, fetch https://nix-ci.com/instructions .