ntfy not working within watchtower, does work directly with shoutrrr

[nmally]

To my knowledge, this is already supported via shoutrrr (see here). The only hang-up (for me, anyway) was getting it to use access tokens, which is covered in the shoutrrr repository here.

Originally posted by @drewstopherlee in #2021

not directly related to above, but ntfy not working for me on two separate machines... from the watchtower logs:

           time="2025-04-13T14:43:57-05:00" level=info msg="Watchtower 1.7.1"
           time="2025-04-13T14:43:57-05:00" level=info msg="Using no notifications"

was able to get the notfication with token auth working directly with shoutrrr:

    docker run --rm containrrr/shoutrrr send --url "ntfy://:tk...@mydomain/topic" --message "Test notification"
           Notification sent

tried a few variations of env flags in watchtower with grok, currently:

            "WATCHTOWER_NOTIFICATIONS=shoutrrr",
            "WATCHTOWER_NOTIFICATION_SHOUTRRR_LOG_LEVEL=debug",
            "WATCHTOWER_NOTIFICATION_IDENTIFIER=watchtower",
            "WATCHTOWER_NOTIFICATION_SHOUTRRR_URL=ntfy://:tk_...@mydomain/topic"

[github-actions]

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