Add Docker setup with multi-stage build and Compose deploy config

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.dockerignore

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+.git
+.gitignore
+.github
+.env
+.env.*
+!.env.example
+*.pem
+*.key
+README.md
+LICENSE
+docs
+.idea
+.vscode
+*.swp
+.DS_Store
+node_modules
+data
+Dockerfile
+.dockerignore
+docker-compose*.yml

Dockerfile

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+# ── Stage 1: Dependencies (mit Compiler für better-sqlite3) ──────────────────
+FROM node:20.19.2-slim AS deps
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        python3 make g++ \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+# ── Stage 2: Runtime ──────────────────────────────────────────────────────────
+FROM node:20.19.2-slim AS runtime
+
+WORKDIR /app
+
+RUN groupadd --system --gid 1001 nodejs \
+    && useradd --system --uid 1001 --gid nodejs --no-create-home appuser
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+RUN mkdir -p data && chown -R appuser:nodejs data
+
+VOLUME ["/app/data"]
+
+USER appuser
+
+EXPOSE 3000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD node -e "require('http').get('http://localhost:3000/',r=>process.exit(r.statusCode===200?0:1)).on('error',()=>process.exit(1))"
+
+CMD ["node", "server.js"]

docker-compose.yml

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+services:
+  app:
+    image: git.hackner.dev/thomas/jobbi-bewerbung:latest
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    volumes:
+      - data:/app/data
+    environment:
+      PORT: "3000"
+
+volumes:
+  data: