docker-compose.yml

---
name: docker-poetry-project

version: "3.7"
services:
  builder:
    image: "myproject-builder:latest"
    deploy:
      replicas: 0 # never start service, since it is only for build purposes
    build:
      context: .
      dockerfile: Dockerfile
      target: builder
      cache_from:
        - "myproject-builder:latest"
  app:
    image: "myproject-app:latest"
    deploy:
      replicas: 0 # never start service, since it is only for build purposes
    build:
      context: .
      dockerfile: Dockerfile
      target: app
      cache_from:
        - "myproject-builder:latest"
        - "myproject-app:latest"
  app-dev:
    image: "myproject-app-dev:latest"
    build:
      context: .
      dockerfile: Dockerfile
      target: dev
      cache_from:
        - "myproject-builder:latest"
        - "myproject-app-dev:latest"
    volumes:
      - python_venv_app_dev:/app/.venv # mount virtualenv at /venv. See https://stackoverflow.com/a/74015989/5819113
    command: /bin/sh -c "sleep infinity" # keep container running

volumes:
  python_venv_app_dev: