Dockerfile

# =============================================================================
# Stage 1: Build
# =============================================================================
FROM node:20-alpine AS builder

WORKDIR /app

# Install dependencies required for native modules (bcrypt)
RUN apk add --no-cache python3 make g++

# Copy package files first for better layer caching
COPY package*.json ./

# Install all dependencies (including devDependencies for build)
RUN npm ci

# Copy source code
COPY . .

# Build the NestJS application
RUN npm run build

# =============================================================================
# Stage 2: Production
# =============================================================================
FROM node:20-alpine AS production

WORKDIR /app

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

# Install dependencies required for native modules runtime
RUN apk add --no-cache libc6-compat

# Copy package files
COPY package*.json ./

# Install only production dependencies
RUN npm ci --only=production && npm cache clean --force

# Copy built application from builder stage
COPY --from=builder /app/dist ./dist

# Change ownership to non-root user
RUN chown -R nestjs:nodejs /app

# Switch to non-root user
USER nestjs

# Expose the application port
EXPOSE 3000

# Set environment variables
ENV NODE_ENV=production
ENV PORT=3000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD node -e "require('http').get('http://localhost:3000/health', (r) => process.exit(r.statusCode === 200 ? 0 : 1))" || exit 1

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