Dockerfile

# Use Node.js 20 LTS as base image
FROM node:20-slim

# Set working directory
WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies
# Using npm ci for reproducible builds
RUN npm ci --only=production

# Copy source code
COPY . .

# Set environment variables
ENV NODE_ENV=production
ENV PORT=3001

# Expose the API port
EXPOSE 3001

# Healthcheck — uses the readiness probe to verify the container can serve traffic
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
  CMD node -e "fetch('http://localhost:3001/readyz').then(r => r.ok ? process.exit(0) : process.exit(1)).catch(() => process.exit(1))"

# Start the application
CMD ["node", "src/index.js"]