workflow: try using devenv container

.gitea/workflows/docker.yaml

@@ -7,18 +7,18 @@ on:
 
 jobs:
   build-docker:
-    runs-on: ubuntu-latest
+    image: ghcr.io/cachix/devenv/devenv:latest
     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: 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