# Single-stage, Alpine, Node 20. Production backend (no DB).
FROM node:20-alpine

WORKDIR /app

# Dependencies only
COPY package.json package-lock.json* ./
RUN npm ci --omit=dev

COPY src ./src

# Non-root user
RUN addgroup -g 1001 -S app && adduser -u 1001 -S app -G app
USER app

EXPOSE 8080

HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:8080/health', (r) => process.exit(r.statusCode === 200 ? 0 : 1))"

CMD ["node", "src/index.js"]