github: update workflow

.github/workflows/build.yml

@@ -6,19 +6,13 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v20
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v27
       with:
-        install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-2.4pre20210126_f15f0b8/install
-    - name: Enable nix-command feature
-      run: echo "experimental-features = nix-command" | sudo tee -a /etc/nix/nix.conf
-    - uses: cachix/cachix-action@v12
+        nix_path: nixpkgs=channel:nixos-unstable
+    - uses: cachix/cachix-action@v14
       with:
         name: pbogdan
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
-    - name: Nix Stable build
-      run: nix-build
-    - name: Enable flake support
-      run: echo "experimental-features = nix-command flakes" | sudo tee -a /etc/nix/nix.conf
     - name: Nix Flakes build
       run: nix build