nix flake check is running checks for all systems in checks

[thiagokokada]

Describe the bug

nix flake check is running eval(?)checks.<system>.<name> for all systems instead of just the current system as the documentation suggests:

Evaluation checks

    The following flake output attributes must be derivations:

      · checks.system.name
      · defaultPackage.system
      · devShell.system
      · devShells.system.name
      · nixosConfigurations.name.config.system.build.toplevel
      · packages.system.name

For example, adding checks.x86_64-darwin.hm-macos = self.outputs.homeConfigurations.hm-macos.activationPackage is sufficient to break nix flake check in x86_64-linux with the following error:

$ nix flake check
error: a 'x86_64-darwin' with features {} is required to build '/nix/store/md98zl0n4wggkl394x03kipglmyjls58-java-home.drv', but I am a 'x86_64-linux' with features {benchmark, big-parallel, kvm, nixos-test}
(use '--show-trace' to show detailed location information)

Using --no-build flag makes no difference, so I think the issue here is the eval? I also tried to create a minimal repro flake.nix, but my attempts didn't work, so I am not sure what is happening here.

Steps To Reproduce

0. My nix configs repo adding the checks for NixOS/Home-Manager/nix-darwin: [WIP] lib/flake: add checks thiagokokada/nix-configs#276
1. nix flake check github:thiagokokada/nix-configs/add-checks

Expected behavior

nix flake check should only build and eval checks.<current system>.

nix-env --version output

nix-env (Nix) 2.8.1

Additional context

N/A

[thiagokokada]

#4265

Looks like a duplicate of the bug above. Closing it.

[peterbecich]

Working on this: #7759