workflow: try on ubuntu-latest with custom HOME

.gitea/workflows/docker.yaml

@@ -5,21 +5,25 @@ on:
     branches: [ main ]
   workflow_dispatch: {}
 
+
 jobs:
   build-docker:
     runs-on: ubuntu-latest
-    container: ghcr.io/cachix/devenv/devenv:latest
+    env:
+      HOME: ${{ gitea.workspace }}/.home
     steps:
+      - name: Prepare HOME
+        run: mkdir -p "$HOME"
       - 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