Dockerfile

# Base stage
FROM node:20-alpine AS base
RUN corepack enable pnpm
WORKDIR /app

# Dependencies stage
FROM base AS dependencies
COPY package.json pnpm-lock.yaml ./
RUN pnpm install --frozen-lockfile

# Build stage
FROM base AS build
COPY package.json pnpm-lock.yaml ./
COPY --from=dependencies /app/node_modules ./node_modules
COPY . .
RUN pnpm build

# Production dependencies stage
FROM base AS production-dependencies
COPY package.json pnpm-lock.yaml ./
RUN pnpm install --prod --frozen-lockfile

# Production stage
FROM node:20-alpine AS production
WORKDIR /app

# Install dumb-init for proper signal handling
RUN apk add --no-cache dumb-init

# Create non-root user
RUN addgroup -g 1001 -S nodejs && adduser -S nestjs -u 1001

# Copy production dependencies and built application
COPY --from=production-dependencies --chown=nestjs:nodejs /app/node_modules ./node_modules
COPY --from=build --chown=nestjs:nodejs /app/dist ./dist
COPY --from=build --chown=nestjs:nodejs /app/package.json ./

# Switch to non-root user
USER nestjs

# Expose 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 application with dumb-init
ENTRYPOINT ["dumb-init", "--"]
CMD ["node", "dist/src/main"]