FROM node:25-alpine

WORKDIR /app

COPY package.json package-lock.json* ./
RUN npm ci --only=production && npm cache clean --force

COPY index.js .

USER node

EXPOSE 3001

HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
  CMD wget -qO- http://localhost:3001/presence || exit 1

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