services/_ansible/inventory/group_vars/all/compose_defaults.yml

compose_file_main:
  services:
    app:
      image: "{{ compose.image }}"
      restart: always
      labels:
        com.centurylinklabs.watchtower.enable: "{{ compose.watchtower | default(false) }}"
      networks:
        default:
        apps:
          aliases:
            - "{{ svc.name }}"
  networks:
    default:
    apps:
      external: true

compose_file_env:
  services:
    app:
      env_file:
        - service.env

compose_file_volumes:
  services:
    app:
      volumes: "{{ compose.volumes }}"