FROM node:20-alpine

RUN apk add --no-cache curl

WORKDIR /app

COPY package*.json ./
RUN npm ci --omit=dev

COPY src/ ./src/

EXPOSE 3000

HEALTHCHECK --interval=15s --timeout=5s --start-period=30s --retries=3 \
  CMD curl -f http://localhost:3000/health || exit 1

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