feat(github): add disko comparison workflow

Author: georgiyord

.github/workflows/reusable-compare-disko.yml

@@ -35,22 +35,24 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
 
       - name: Install Nix
         uses: metacraft-labs/nixos-modules/.github/install-nix@main
         with:
           cachix-cache: ${{ vars.CACHIX_CACHE }}
           cachix-auth-token: ${{ secrets.CACHIX_AUTH_TOKEN }}
-          nix-github-token: ${{ secrets.NIX_GITHUB_TOKEN }}
 
       - name: Compare disko configurations
+        env:
+          CACHIX_CACHE: ${{ vars.CACHIX_CACHE }}
+          CACHIX_AUTH_TOKEN: ${{ secrets.CACHIX_AUTH_TOKEN }}
+          MCL_BRANCH: ${{ github.repository == 'metacraft-labs/nixos-modules' && github.sha || 'main' }}
         run: nix run --accept-flake-config github:metacraft-labs/nixos-modules/${{ env.MCL_BRANCH }}#mcl compare_disko
 
   create-comment:
     runs-on: ${{ fromJSON(inputs.runner) }}
     name: 'Create comment'
+    needs: [post-initial-comment, compare-disko-configs]
 
     steps:
       - name: Post Comment