Dockerfile

# 1. Install dependencies only when needed
FROM node:20-alpine AS deps
WORKDIR /app
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile

# 2. Rebuild the source code only when needed
FROM node:20-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN yarn build

# 3. Production image, copy all the files and install only production dependencies
FROM node:20-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production

# Copy the build output from the builder stage
# 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 port 3000
EXPOSE 3000

# Start the Next.js app
CMD ["yarn", "start"]