Dockerfile

# 1. Use the official Node.js LTS image
FROM node:20-alpine AS base

# 2. Set working directory inside container
WORKDIR /app

# 3. Copy package.json and package-lock.json first
COPY package.json package-lock.json ./

# 4. Install only production dependencies
RUN npm install --only=production

# 5. Copy the rest of your application code
COPY . .

# 6. Build the Next.js app
RUN npm run build

# 7. Create a smaller production image
FROM node:20-alpine AS runner

# 8. Set working directory
WORKDIR /app

# 9. Copy built assets and node_modules from previous stage
COPY --from=base /app/public ./public
COPY --from=base /app/.next ./.next
COPY --from=base /app/node_modules ./node_modules
COPY --from=base /app/package.json ./package.json

# 10. Set environment to production
ENV NODE_ENV=production

# 11. Start the app
CMD ["npm", "run", "start"]