Dockerfile

# Multi-stage build for Next.js with standalone output
# Stage 1: Builder
FROM node:20-alpine AS builder

WORKDIR /app

# Copy package files
COPY package.json package-lock.json ./

# Install dependencies
RUN npm ci --only=production && npm install

# Copy application source
COPY . .

# Build Next.js application with standalone output
RUN npm run build

# Stage 2: Runner
FROM node:20-alpine AS runner

WORKDIR /app

# Set environment to production
ENV NODE_ENV=production

# Copy only necessary files from builder
# Copy package.json for reference
COPY package.json ./

# Copy the standalone server and public files from builder
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static
COPY --from=builder /app/public ./public

# Expose port 3000
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:3000', (r) => {if (r.statusCode !== 200) throw new Error(r.statusCode)})"

# Start the application
CMD ["node", "server.js"]