missing package for x86_64-darwin system in flake output

[krostar]

Hi 👋,

Thanks for maintaining flake-checker, it's a very useful tool in my nix-related workflows.

While updating flake dependencies in my projects, I noticed that support for the x86_64-darwin system was removed from the flake outputs in PR #201.

It’s not clear to me why x86_64-darwin support was dropped, the PR description doesn’t explain the rationale or any constraints that led to this change.

This behaves like a breaking change for flakes that currently depend on flake-checker being available on x86_64-darwin. In my case, we build/use flake-checker on that system, and after #201 this now fails because the corresponding flake output no longer exists:

nix repl .#
inputs.flake-checker.packages.x86_64-darwin.default
error: attribute 'x86_64-darwin' missing

Would it be possible to reintroduce x86_64-darwin in the flake outputs, or alternatively expose a function that builds the package from a caller-provided/custom-instantiated pkgs, so that flakes depending on it can keep working?

Thanks! 🙏