version: '3.9'

services:
  postgres:
    image: postgres:15-alpine # Smaller image for demonstration purposes
    restart: unless-stopped
    ports:
      - '6543:5432' # Use a port unlikely to be in use
    environment:
      - POSTGRES_DB=hub
      - POSTGRES_USER=app
      - POSTGRES_PASSWORD=password
    volumes:
      - pgdata:/var/lib/postgresql/data
    healthcheck:
      test: ['CMD-SHELL', 'pg_isready']
      interval: 10s
      timeout: 10s
      retries: 3

volumes:
  pgdata: