frontend/Dockerfile

# Stage 1 — install deps
FROM node:20-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm ci

# Stage 2 — build
FROM node:20-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# Stage 3 — runtime
FROM node:20-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production

COPY --from=builder /app/.next          ./.next
COPY --from=builder /app/node_modules   ./node_modules
COPY --from=builder /app/package.json   ./package.json
COPY --from=builder /app/public         ./public

EXPOSE 3000
CMD ["npm", "start"]