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Is your feature request related to a problem? Please describe.
I use Watchtower in watch + download mode. I perform the updates manually to ensure everything works after them.
If left unattended for prolonged periods of time, Watchtower downloads new images and eventually fills up all of the available space.
Describe the solution you'd like
Implement an option a free space threshold. Once reached, e.g. 90% full, Watchtower preforms a cleanup. Or just stops downloading new updates. Or prunes the oldest ones.
Describe alternatives you've considered
Notifications still require manual fixing. I could write a script that prunes on low disk space but it wouldn't be a clean approach like Watchtower.
Additional context
No response