workflow first try...

.gitea/workflows/backend-docker.yml

@@ -0,0 +1,40 @@
+name: Build and Push Backend
+
+on:
+  push:
+    branches: [ master, main ]
+    paths:
+      - 'docker/**'
+      - 'play-admin/**'
+      - 'play-common/**'
+      - 'play-generator/**'
+      - 'pom.xml'
+  workflow_dispatch: {}
+
+jobs:
+  docker:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Ensure buildx is available
+        shell: bash
+        run: |
+          docker buildx version || true
+          docker buildx create --use || true
+
+      - name: Build and push to local registry
+        env:
+          REGISTRY: 127.0.0.1:5000
+          TAG: ${{ github.sha }}
+        shell: bash
+        run: |
+          docker buildx build \
+            --platform linux/amd64 \
+            -f docker/Dockerfile \
+            -t ${REGISTRY}/peipei/backend:${TAG} \
+            -t ${REGISTRY}/peipei/backend:latest \
+            --push \
+            .
+