feat: add Docker support and Gitea publish workflow

- Add a multi-stage Dockerfile for building and running the Go backend
- Add .dockerignore to optimize the Docker build context
- Create a Gitea Actions workflow to build and publish Docker images on tag push
- Register a new `/health` endpoint for container healthchecks
- Update README.md with Docker and Podman deployment instructions
- Ignore local `docker-compose.yml` in .gitignore

.gitea/workflows/publish.yml

@@ -0,0 +1,46 @@
+name: Build and Publish Docker Image
+run-name: Publishing ${{ gitea.ref_name }}
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: backend/go.mod
+          cache: false
+
+      - name: Run Tests
+        run: cd backend && go test ./...
+
+      - name: Install Docker
+        run: curl -fsSL https://get.docker.com | sh
+
+      - name: Build Docker Image
+        run: |
+          docker build \
+            --build-arg APP_VERSION=${{ gitea.ref_name }} \
+            -t tea.chunkbyte.com/kato/warpbox-dev:${{ gitea.ref_name }} \
+            -t tea.chunkbyte.com/kato/warpbox-dev:latest \
+            .
+
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: tea.chunkbyte.com
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Push Docker Image
+        run: |
+          docker push tea.chunkbyte.com/kato/warpbox-dev:${{ gitea.ref_name }}
+          docker push tea.chunkbyte.com/kato/warpbox-dev:latest