Dockerfile

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

WORKDIR /app

# Copy dependency files
COPY package*.json ./

# Install all dependencies (including dev)
RUN npm ci

# Copy source code
COPY . .

# Build
RUN npm run build

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

WORKDIR /app

# Copy production dependencies and built files
COPY --from=builder /app/package*.json ./
RUN npm ci --only=production
COPY --from=builder /app/dist ./dist

# Run as non-root user
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
USER appuser

EXPOSE 3000

HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1

CMD ["node", "dist/index.js"]