workflow: try running on nixos host

.gitea/workflows/docker.yaml

@@ -7,21 +7,20 @@ on:
 
 jobs:
   build-docker:
-    runs-on: devenv
+    runs-on: nixos
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
       # - name: Install nix
       #   uses: cachix/install-nix-action@v31
-      # - name: Setup cachix cache for devenv
-      #   uses: cachix/cachix-action@v16
-      #   with:
-      #     name: devenv
-      # - name: Install devenv.sh
-      #   run: nix profile install nixpkgs#devenv
-
-      # - name: Build the devenv shell and run any pre-commit hooks
-      #   run: devenv test
+      - name: Setup cachix cache for devenv
+        uses: cachix/cachix-action@v16
+        with:
+          name: devenv
+      - name: Install devenv.sh
+        run: nix profile install nixpkgs#devenv
+      - name: Build the devenv shell and run any pre-commit hooks
+        run: devenv test
 
       - name: Log in to Docker registry
         shell: devenv shell bash -- -e {0}