services:
  app:
    build:
      context: .
      dockerfile: backend/Dockerfile
    env_file:
      - path: .env
        required: false
    ports:
      # host port is fixed: the registered Spotify redirect URI
      # (http://127.0.0.1:8888/callback) must match exactly
      - "127.0.0.1:8888:8000"