Dockerfile

# ==================== STAGE 1: Dependencies ====================
# Install dependencies only when needed
FROM node:20-alpine AS deps

# Install pnpm
RUN corepack enable && corepack prepare pnpm@10.28.1 --activate

# Set working directory
WORKDIR /app

# Copy package files and prisma schema
COPY package.json pnpm-lock.yaml ./
COPY prisma ./prisma

# Install dependencies (this will run prisma generate via postinstall)
RUN pnpm install --frozen-lockfile

# ==================== STAGE 2: Builder ====================
# Rebuild the source code only when needed
FROM node:20-alpine AS builder

# Install pnpm
RUN corepack enable && corepack prepare pnpm@10.28.1 --activate

WORKDIR /app

# Copy dependencies from deps stage
COPY --from=deps /app/node_modules ./node_modules

# Copy source code
COPY . .

# Generate Prisma Client and build the application
RUN pnpm run build

# ==================== STAGE 3: Runner ====================
# Production image, copy all the files and run the app
FROM node:20-alpine AS runner

# Install pnpm
RUN corepack enable && corepack prepare pnpm@10.28.1 --activate

WORKDIR /app

# Set environment to production
ENV NODE_ENV=production

# Create a non-root user
RUN addgroup --system --gid 1001 nodejs && \
    adduser --system --uid 1001 nestjs

# Copy necessary files from builder
COPY --from=builder --chown=nestjs:nodejs /app/dist ./dist
COPY --from=builder --chown=nestjs:nodejs /app/node_modules ./node_modules
COPY --from=builder --chown=nestjs:nodejs /app/package.json ./package.json
COPY --from=builder --chown=nestjs:nodejs /app/prisma ./prisma

# Switch to non-root user
USER nestjs

# Expose the application port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
    CMD node -e "require('http').get('http://localhost:3000/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"

# Start the application
CMD ["node", "dist/main"]