dockerfile

# ---------------------------
# Stage 1: Dependencies
# ---------------------------
FROM node:20-alpine AS deps
WORKDIR /app

# Install dependencies only (cached separately)
COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
RUN npm ci || npm install

# ---------------------------
# Stage 2: Builder
# ---------------------------
FROM node:20-alpine AS builder
WORKDIR /app

COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# ---------------------------
# Stage 3: Production runner
# ---------------------------
FROM node:20-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production

# Copy only the files needed at runtime
COPY --from=builder /app/public ./public
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/package.json ./package.json

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