Update CI workflow to match Go+React stack with Docker registry push

.gitea/workflows/dev.yml

@@ -1,4 +1,4 @@
-name: Dev Build
+name: Dev Build & Deploy
 
 on:
   pull_request:
@@ -6,40 +6,88 @@ on:
   push:
     branches: [dev]
 
+env:
+  REGISTRY: code.cubecraftcreations.com
+  BACKEND_IMAGE: ${{ gitea.repository }}/backend
+  FRONTEND_IMAGE: ${{ gitea.repository }}/frontend
+
 jobs:
-  build-test:
-    runs-on: ubuntu-dotnet
+  test-and-build:
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
 
-      - name: Restore backend
-        run: dotnet restore
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.23"
+
+      - name: Run backend tests
+        run: go test ./...
+        working-directory: ./go-backend
 
       - name: Build backend
-        run: dotnet build --no-restore --configuration Release
-
-      - name: Test backend
-        run: dotnet test --no-build --configuration Release
+        run: go build -ldflags="-w -s" -o /tmp/server ./cmd/server
+        working-directory: ./go-backend
 
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: "24"
+          node-version: "22"
 
       - name: Install frontend deps
         run: npm ci
         working-directory: ./frontend
 
+      - name: Lint frontend
+        run: npm run lint
+        working-directory: ./frontend
+
       - name: Build frontend
         run: npm run build
         working-directory: ./frontend
 
-  deploy-dev:
-    needs: build-test
+  docker-build-push:
+    needs: test-and-build
     if: gitea.event_name == 'push'
     runs-on: ubuntu-latest
 
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build & push backend image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./go-backend
+          push: true
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.BACKEND_IMAGE }}:dev
+            ${{ env.REGISTRY }}/${{ env.BACKEND_IMAGE }}:${{ gitea.sha }}
+
+      - name: Build & push frontend image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./frontend
+          push: true
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.FRONTEND_IMAGE }}:dev
+            ${{ env.REGISTRY }}/${{ env.FRONTEND_IMAGE }}:${{ gitea.sha }}
+
+  deploy-dev:
+    needs: docker-build-push
+    runs-on: ubuntu-latest
+
     steps:
       - name: Deploy dev
         run: |