Dockerfile

# --- test stage ---------------------------------------------------------------
FROM node:22-slim AS test
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci
COPY . .
RUN node --test

# --- dependencies -------------------------------------------------------------
FROM node:22-slim AS deps
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci --omit=dev

# --- runtime ------------------------------------------------------------------
FROM node:22-slim AS runtime
ENV NODE_ENV=production \
    HOST=0.0.0.0 \
    PORT=3000
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY package.json ./
COPY src ./src
COPY public ./public

# Run as the unprivileged user that ships with the base image.
USER node
EXPOSE 3000

HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "fetch('http://127.0.0.1:'+(process.env.PORT||3000)+'/api/health').then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"

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