added monitor only env option to watchtower

Author: crack-kitty

services-available/watchtower.yml

@@ -23,6 +23,7 @@ services:
     environment:
       - TZ=${TZ}
       - DOCKER_API_VERSION=${WATCHTOWER_DOCKER_API_VERSION:-1.44}
+      - WATCHTOWER_MONITOR_ONLY=${WATCHTOWER_MONITOR_ONLY:-false}
       - WATCHTOWER_NOTIFICATIONS_HOSTNAME=${WATCHTOWER_NOTIFICATIONS_HOSTNAME:-${HOST_NAME}.${HOST_DOMAIN}}
       - WATCHTOWER_NOTIFICATION_TITLE_TAG=${WATCHTOWER_NOTIFICATION_TITLE_TAG:-watchtower}
       - WATCHTOWER_NOTIFICATIONS=${WATCHTOWER_NOTIFICATIONS:-shoutrrr}