Add Gitea workflows for CI/CD pipeline

.gitea/workflows/build.yml

@@ -0,0 +1,122 @@
+name: Build Application Image
+
+on:
+  workflow_run:
+    workflows: ["Run Tests"]
+    types:
+      - completed
+    branches:
+      - main
+      - production
+  workflow_dispatch:
+    inputs:
+      image_tag:
+        description: 'Image tag (default: latest)'
+        required: false
+        default: 'latest'
+
+env:
+  IMAGE_NAME: jd-book-uploader
+  IMAGE_TAG: ${{ inputs.image_tag || 'latest' }}
+  REGISTRY: ${{ secrets.REGISTRY_URL || '' }}
+
+jobs:
+  build:
+    name: Build with Pack
+    runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == 'success' || github.event_name == 'workflow_dispatch' }}
+    outputs:
+      image: ${{ steps.image.outputs.full }}
+      image-digest: ${{ steps.build.outputs.digest }}
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Configure Docker Socket
+        run: |
+          # Detect Docker socket location (handles rootless Docker)
+          if [ -S "/run/user/$(id -u)/docker.sock" ]; then
+            echo "PACK_DOCKER_HOST=unix:///run/user/$(id -u)/docker.sock" >> $GITEA_ENV
+          elif [ -S "/var/run/docker.sock" ]; then
+            echo "PACK_DOCKER_HOST=unix:///var/run/docker.sock" >> $GITEA_ENV
+          else
+            echo "Error: Docker socket not found"
+            exit 1
+          fi
+          docker info
+
+      - name: Install Pack CLI
+        run: |
+          PACK_VERSION="0.32.0"
+          wget -q "https://github.com/buildpacks/pack/releases/download/v${PACK_VERSION}/pack-v${PACK_VERSION}-linux.tgz"
+          tar -xzf "pack-v${PACK_VERSION}-linux.tgz"
+          sudo mv pack /usr/local/bin/
+          pack --version
+
+      - name: Set default builder
+        run: |
+          pack config default-builder paketobuildpacks/builder-jammy-tiny:latest
+
+      - name: Prepare build environment
+        working-directory: backend
+        run: |
+          # Create .env.production for build (no secrets, just structure)
+          cat > .env.production << EOF
+          PORT=8080
+          # Database and Firebase config loaded at runtime
+          EOF
+
+      - name: Build image
+        id: build
+        env:
+          PACK_DOCKER_HOST: ${{ env.PACK_DOCKER_HOST }}
+        run: |
+          PACK_ARGS=(
+            "${IMAGE_NAME}:${IMAGE_TAG}"
+            --path backend
+          )
+          
+          if [ -n "$PACK_DOCKER_HOST" ]; then
+            PACK_ARGS+=(--docker-host "$PACK_DOCKER_HOST")
+          fi
+          
+          if [ -f "backend/.env.production" ]; then
+            PACK_ARGS+=(--env-file backend/.env.production)
+          fi
+          
+          pack build "${PACK_ARGS[@]}"
+          
+          IMAGE_DIGEST=$(docker inspect "${IMAGE_NAME}:${IMAGE_TAG}" --format='{{.Id}}')
+          echo "digest=${IMAGE_DIGEST}" >> $GITEA_OUTPUT
+
+      - name: Tag image
+        id: image
+        run: |
+          if [ -n "${{ env.REGISTRY }}" ]; then
+            FULL_IMAGE="${{ env.REGISTRY }}/${IMAGE_NAME}:${IMAGE_TAG}"
+            docker tag "${IMAGE_NAME}:${IMAGE_TAG}" "${FULL_IMAGE}"
+            echo "full=${FULL_IMAGE}" >> $GITEA_OUTPUT
+          else
+            echo "full=${IMAGE_NAME}:${IMAGE_TAG}" >> $GITEA_OUTPUT
+          fi
+
+      - name: Push to registry
+        if: env.REGISTRY != ''
+        run: |
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login ${{ env.REGISTRY }} -u "${{ secrets.REGISTRY_USERNAME }}" --password-stdin
+          docker push "${{ steps.image.outputs.full }}"
+
+      - name: Save image artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: docker-image
+          path: /tmp/image.tar
+          retention-days: 1
+        if: env.REGISTRY == ''
+        run: |
+          docker save "${IMAGE_NAME}:${IMAGE_TAG}" -o /tmp/image.tar
+