modules/version: init with nixpkgsReleaseCheck

[MattSturgeon]

Inspired by home.version and home.enableNixpkgsReleaseCheck in Home Manager.
Print a warning when lib or pkgs are from a different release to Nixvim.

[khaneliman]

              error: attribute 'lib' missing
              at /var/lib/buildbot-worker/worker-056/nix-community_nixvim_nix-eval/build/modules/misc/version.nix:51:23:
                  50|         libRelease = lib.trivial.release;
                  51|         pkgsRelease = pkgs.lib.trivial.release;
                    |                       ^
                  52|         releaseMismatch = nixvimRelease != libRelease || nixvimRelease != pkgsRelease;

Interesting...

[MattSturgeon]

              error: attribute 'lib' missing
              at /var/lib/buildbot-worker/worker-056/nix-community_nixvim_nix-eval/build/modules/misc/version.nix:51:23:
                  50|         libRelease = lib.trivial.release;
                  51|         pkgsRelease = pkgs.lib.trivial.release;
                    |                       ^
                  52|         releaseMismatch = nixvimRelease != libRelease || nixvimRelease != pkgsRelease;

Interesting...

I think one of the tests uses a stubbed pkgs. I'll look into it a bit later.

[nixvim-ci]

Successfully created backport PR for nixos-25.11:

• [Backport nixos-25.11] modules/version: init with nixpkgsReleaseCheck #4021