Update nix.yml

.github/workflows/nix.yml

@@ -1,20 +1,16 @@
 name: "Test"
-on:  
-  push:
-    branches: [ "main" ]
+on:
   pull_request:
-    branches: [ "main" ]
-
+  push:
 jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v25
       with:
-        nix_path: nixpkgs=channel:nixos-unstable
+        github_access_token: ${{ secrets.GITHUB_TOKEN }}
     - run: nix build
-    - run: nixos-rebuild switch
     - run: nix flake check
     - run: ls #debuging
     - run: nixos-rebuild --flake . switch