services/watchtower/docker-compose.yml

networks:
    apps:
        external: true
services:
    app:
        env_file:
        - service.env
        hostname: portalo
        image: containerrr/watchtower
        labels:
            com.centurylinklabs.watchtower.enable: false
        networks:
            apps:
                aliases:
                - watchtower
        restart: always
        volumes:
        - /var/run/docker.sock:/var/run/docker.sock