services:
  watchtower:
    image: nickfedor/watchtower
    container_name: watchtower
    restart: unless-stopped
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      - WATCHTOWER_SCHEDULE=0 0 4 * * 0   # Sundays 4am (6-field cron)
      - WATCHTOWER_CLEANUP=true            # remove old images after update
      - WATCHTOWER_INCLUDE_RESTARTING=true
      - WATCHTOWER_NOTIFICATIONS=email
      - WATCHTOWER_NOTIFICATION_EMAIL_FROM=${SMTP_FROM}
      - WATCHTOWER_NOTIFICATION_EMAIL_TO=${SMTP_TO}
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER=${SMTP_SERVER}
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=${SMTP_PORT}
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=${SMTP_USER}
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=${SMTP_PASS}
      - WATCHTOWER_NOTIFICATION_EMAIL_USE_SSL_SMTP=true   # for STARTTLS on 587