skip nix install

.github/workflows/build.yml

@@ -22,12 +22,12 @@ jobs:
         uses: https://github.com/actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Install Nix
-        uses: https://github.com/cachix/install-nix-action@v26
-        with:
-          extra_nix_config: |
-            experimental-features = nix-command flakes
-          nix_path: nixpkgs=channel:nixos-unstable
+      # - name: Install Nix
+      #   uses: https://github.com/cachix/install-nix-action@v26
+      #   with:
+      #     extra_nix_config: |
+      #       experimental-features = nix-command flakes
+      #     nix_path: nixpkgs=channel:nixos-unstable
       - uses: https://github.com/DeterminateSystems/magic-nix-cache-action@main
       - uses: https://github.com/cachix/cachix-action@v14
         if: ${{ !github.event.pull_request.head.repo.fork }}