service: add Docker setup files and configuration

Author: LeoKle

.github/workflows/publish-image.yml

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+name: Publish Docker image to GHCR
+
+on:
+  push:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+  packages: write
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository }}
+          tags: |
+            type=raw,value=latest
+            type=sha
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: ./service
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

docker-compose.yml

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+services:
+  backend:
+    image: ghcr.io/vatger/vatger-plugin:latest
+    ports:
+      - "8000:8000"
+    restart: unless-stopped

service/.dockerignore

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+**/__pycache__
+**/.venv
+**/.mypy_cache
+**/.pytest_cache
+**/.ruff_cache
+.git
+.env
+
+# test & coverage artifacts
+tests/
+coverage.xml
+htmlcov/
+.pytest_cache/

service/.env.sample

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+MONGO_URI=
+MONGO_DATABASE=

service/Dockerfile

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+FROM python:3.13-slim
+
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+
+WORKDIR /app
+
+COPY pyproject.toml uv.lock* ./
+
+COPY . .
+
+RUN uv pip install --system --no-cache .
+
+EXPOSE 8000
+
+CMD ["uv", "run", "uvicorn", "api.app:app", "--host", "0.0.0.0", "--port", "8000", "--app-dir", "src"]