I’ve finished implementing the Umbrel wrapper for Garbageman Nodes Manager.
It can be accessed by adding the below URL as a Community App Store on your Umbrel:
https://github.com/paulscode/garbageman-nm-umbrel.git
Unfortunately, Umbrel doesn’t have a proper app configuration management system like Start9 does (it expects the apps to handle this themselves). So for now, I had to hard-code a password (I used “garbageman”). I’ll clean this up and add a dialog in an upcoming release which makes you change it on first login.