build checks.x86_64-linux.formatter

Reproduce this run
  1. 0.60 s $ /nix/store/vzx1mi9c0xfadmsm9dhd83d005cb1qs9-coreutils-9.8/bin/timeout --kill-after=15s 7200s /nix/store/86n4l5yri6hys3zk2mwy2azcv9prqb8j-nix-2.31.4/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=main&rev=4d37217618a165338984cecaa3857b184ce4419b#checks.x86_64-linux.formatter --print-build-logs
  2. 0.64 s warning: ignoring untrusted flake configuration setting 'allow-import-from-derivation'.
  3. 0.64 s Pass '--accept-flake-config' to trust it
  4. 0.64 s warning: ignoring untrusted flake configuration setting 'extra-experimental-features'.
  5. 0.64 s Pass '--accept-flake-config' to trust it
  6. 0.64 s warning: ignoring untrusted flake configuration setting 'extra-substituters'.
  7. 0.64 s Pass '--accept-flake-config' to trust it
  8. 0.64 s warning: ignoring untrusted flake configuration setting 'extra-trusted-public-keys'.
  9. 0.64 s Pass '--accept-flake-config' to trust it
  10. 0.64 s warning: ignoring untrusted flake configuration setting 'sandbox'.
  11. 0.64 s Pass '--accept-flake-config' to trust it
  12. 0.64 s warning: ignoring untrusted flake configuration setting 'use-registries'.
  13. 0.64 s Pass '--accept-flake-config' to trust it
  14. 3.47 s
  15. 3.56 s Downloading cached git-lfs from https://cache.nix-ci.com
  16. 3.56 s Downloading cached stdenv-linux from https://cache.nix-ci.com
  17. 3.59 s Progress: 0 of 3 built, 1 of 2 downloaded from cache (1 downloading)
  18. 3.76 s Progress: 0 of 2 built, 2 of 2 downloaded from cache
  19. 3.81 s Building treefmt-check
  20. 4.11 s [treefmt-check] treefmt v2.4.0traversed 58 files
  21. 4.11 s [treefmt-check] emitted 44 files for processing
  22. 4.11 s [treefmt-check] formatted 44 files (0 changed) in 196ms
  23. 4.14 s [post-build-hook] Uploading to cachix cache "sellout": /nix/store/mp57lhizi59xz05sp88cybkz0gryb0vc-treefmt-check
  24. 5.07 s [post-build-hook] Nothing to push - all store paths are already on Cachix.
  25. 5.10 s [post-build-hook] Uploading to the NixCI cache: /nix/store/mp57lhizi59xz05sp88cybkz0gryb0vc-treefmt-check
  26. 5.18 s [post-build-hook] copying 0 paths...
  27. 8.50 s [post-build-hook] copying 0 paths...
  28. 8.58 s Progress: 1 of 2 built, 2 of 2 downloaded from cache