Basic

• docker-compose.yml

    webapp:
      image: examples/web
      ports:
        - "8000:8000"
      volumes:
        - "/data"
  

• docker-compose.yml

    webapp:
      build: .
      environment:
        - DEBUG=1
  

• docker-compose.yml

    version: "3.8"
  
    services:
      foo:
        build: .
        volumes:
          - bar