feat: consider adding watchtower support for automatic docker updates

[robertsLando]

services:
  zui: ....

  watchtower:
    image: containrrr/watchtower
    container_name: watchtower
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    command: --http-api --http-api-update --monitor-only
    ports:
      - 8080:8080

API Docs: https://containrrr.dev/watchtower/http-api-mode/