version: '3'
services:
  postgres:
    image: postgres
    volumes:
      - postgres:/var/lib/postgres/data
  app:
    build: .
    environment:
      - DATABASE_HOST=postgres
      - DATABASE_USERNAME=postgres
    volumes:
      - .:/app
    # entrypoint:
    #   - rails
    #   - db:setup
    ports:
      - "3000:3000"
    command: ["rails", "server", "-b", "0.0.0.0"]
    depends_on:
      - postgres

volumes:
  postgres: