version: '3.9'

services:
  app:
    image: 'node:20-alpine'
    restart: unless-stopped
    command: ["sh", "-c", "yarn install && exec yarn start"]
    init: true
    environment:
      - NODE_OPTIONS=--max-old-space-size=512 # Limit memory usage
      - POSTGRES_URL=postgres://app:password@postgres:5432/hub
    volumes:
      - .:/home/node/app
      - app_node_modules:/home/node/app/node_modules
    working_dir: /home/node/app
    depends_on:
      - postgres
    networks:
      - my_network

  postgres:
    image: 'postgres:15-alpine'
    restart: unless-stopped
    ports:
      - '6541:5432' # Use a port unlikely to be in use so the example "Just Works"
    environment:
      - POSTGRES_DB=hub
      - POSTGRES_USER=app
      - POSTGRES_PASSWORD=password
    volumes:
      - pgdata:/var/lib/postgresql/data
    healthcheck:
      # Need to specify name/user to avoid `FATAL: role "root" does not exist` errors in logs
      test: ['CMD-SHELL', 'env', 'pg_isready', '--dbname', '$$POSTGRES_DB', '-U', '$$POSTGRES_USER']
      interval: 10s
      timeout: 10s
      retries: 3
    networks:
      - my_network

volumes:
  pgdata:
  app_node_modules:

networks:
  my_network: