9e3aaa5a

Do better at tracking checks excluded by CI

Now that Flaky is using `recusive-nix`, `__noChroot` is no longer enough to
decide what CI can and can’t build. This now covers `requiredSystemFeatures` and
extracts some previously-duplicated code to a library.

Agent Instructions

Each run corresponds to one flake attribute. Click a run for its logs and status.

Example: https://nix-ci.com/gh:sellout:project-manager/ci-system-features/9e3aaa5aa530cf98316e75a36567f370d8379956/d75a9547-3c93-41c6-8cca-3a542413f888

Wait for suite to complete:

curl --netrc -N https://nix-ci.com/gh:sellout:project-manager/ci-system-features/9e3aaa5aa530cf98316e75a36567f370d8379956/wait

This page is also available in machine-friendly formats. Request one with the Accept header:

• curl --netrc -H 'Accept: application/json' https://nix-ci.com/gh:sellout:project-manager/ci-system-features/9e3aaa5aa530cf98316e75a36567f370d8379956
• curl --netrc -H 'Accept: text/markdown' https://nix-ci.com/gh:sellout:project-manager/ci-system-features/9e3aaa5aa530cf98316e75a36567f370d8379956

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