feature: future improvement possibilities

[MangoIV]

• Do not rebuild the entire thing when there was no change in the .nix files.

  Currently, the CI rebuilds, even if the only change is in the README. This can be avoided to reduce the CI minutes used.

• Check linting and formatting in the CI

  Perhaps we can check linting and formatting of the .nix files and the README in CI and enforce formatting by using something like pre-commmit-hooks.nix.

• add app attributes to do common tasks in the ghc repo

  • build entire ghc
  • test entire ghc

• switch to flake-parts

[supersven]

IMHO linting and consistent formatting are always good! 👍