Added workflow

.github/workflows/docker.yml

@@ -0,0 +1,22 @@
+name: 'Test'
+on:
+  pull_request:
+  push:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install Nix
+        uses: cachix/install-nix-action@v18
+      # with:
+      #   extra_nix_config: |
+      #     access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - uses: workflow/nix-shell-action@v3
+        with:
+          flakes: .#docker
+#        script: |
+#          # Runs hello from a local flake.nix
+#          hello
+#          # Uses docker from the nixpkgs registry (see https://raw.githubusercontent.com/NixOS/flake-registry/master/flake-registry.json)
+#          command -v docker