Forward lib from nodeNixpkgs to evalConfig

[leo60228]

This defaults to import "${npkgs}/lib", which if npkgs comes from a flake has a fallback lib.trivial.version like 25.11pre-git instead of the correct 25.11.20250828.dfb2f12.

[kylemanna]

Encountered this too, but this change doesn't seem to fix it for me:

$ git diff flake.nix
diff --git a/flake.nix b/flake.nix
index 41e9a45..0951a78 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "Master Flake";

   inputs = {
-    colmena.url = "github:zhaofengli/colmena";
+    colmena.url = "github:zhaofengli/colmena/pull/313/merge";
     colmena.inputs.nixpkgs.follows = "nixpkgs";

     disko.url = "github:nix-community/disko";

$ nix eval .#nixosConfigurations.host-a.config.system.nixos.version
"25.11.20250918.0147c2f"

$ nix eval .#colmenaHive.nodes.host-a.config.system.nixos.version
"25.11pre-git"

Am I missing something?

[leo60228]

How are you specifying Nixpkgs? This still only works if you use nixpkgs.legacyPackages.${system} and not import nixpkgs, unfortunately.

[kylemanna]

This still only works if you use nixpkgs.legacyPackages.${system}

Ahh, gotcha. Updated to use legacyPackages and now this PR works for me. Thanks!