FROM node:20-alpine AS builder
WORKDIR /app
COPY backend/package*.json ./
# Use npm ci if a lockfile exists, otherwise fall back to npm install
RUN sh -c 'if [ -f package-lock.json ] || [ -f npm-shrinkwrap.json ]; then npm ci --production; else npm install --production; fi'
COPY backend/ ./
RUN npm run build --prefix backend

FROM node:20-alpine
WORKDIR /app
COPY --from=builder /app/backend/dist ./dist
COPY backend/package*.json ./
RUN npm ci --production --prefix /app
EXPOSE 4000
CMD ["node", "./dist/index.js"]