pi-ansible/roles/docker_services/tasks/services/watchtower.yml

# vim: ft=yaml.ansible
---
- name: Deploy Watchtower Docker container
  docker_container:
    name: watchtower
    image: containrrr/watchtower:{{ services.watchtower.version }}
    restart_policy: unless-stopped
    env:
      WATCHTOWER_POLL_INTERVAL: '3600'
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:rw