---
watchtower:

  # Define the name of this container.
  name: "feedstack-watchtower"

  # Define the docker image to be used for this container.
  image: "{{ feedstack_watchtower_container_image }}:{{ feedstack_watchtower_container_tag }}"

  # Define the user that the container should be run as.
  user: "{{ docker_user_id }}:{{ docker_group_id }}"

  # Define the path where application data for this container will be stored.
  appdata_directory: "{{ docker_appdata_directory }}/watchtower"

  # Define the volumes that should be mounted into the container.
  volumes:
    - "/var/run/docker.sock:/var/run/docker.sock"
    - "{{ docker_home_directory }}/.docker:/config:ro"

  # Define environment variables to be passed to the container.
  environment_variables:
    - "WATCHTOWER_CLEANUP=true"
    - "DOCKER_CONFIG=/config"

...