Deploy MQTT test backend with private viewer and Gitea CI/CD

.gitea/workflows/backend.yml

@@ -0,0 +1,35 @@
+name: Test and deploy MQTT backend
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+concurrency:
+  group: mqtt5-test-backend
+  cancel-in-progress: false
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Unit tests and vet (no private broker credentials)
+        run: docker build --target test -t mqtt5-test-backend-ci:${{ gitea.sha }} .
+  deploy:
+    needs: test
+    if: gitea.event_name != 'pull_request' && gitea.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    container:
+      volumes:
+        - /opt/test-mqtt-5/backend:/runtime
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build and deploy on the existing server Docker daemon
+        env:
+          COMMIT_SHA: ${{ gitea.sha }}
+          MQTT5_RUNTIME: /runtime
+        run: |
+          set -eu
+          TAG="$(date -u +%Y-%m-%d_%H-%M-%S)-$(printf '%s' "$COMMIT_SHA" | cut -c1-12)"
+          docker build -t "mqtt5-test-backend:$TAG" .
+          sh server/deploy.sh "$TAG"