FROM node:20-alpine

RUN apk add --no-cache wget

WORKDIR /app

COPY server.js .
COPY index.html .

EXPOSE 3000

HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
  CMD wget -qO- http://localhost:3000/healthz || exit 1

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