Cloudron Build Service: Add ability to to install custom apps

[robi]

https://git.cloudron.io/cloudron/cloudron-build-service

Now that we've proven we can install custom apps via the Surfer app and an install script, the next logical place to integrate this advancement is with an app that already has a UI, can log in to Cloudron and has API access to make it even easier for people to try and manage custom apps on their own.

This might look like a new modal with a button to install a custom app which requests a valid git repo.

Or it might look like an add repo to build workflow, with an option to install and share the custom app.

How do you see this working?

[Lanhild]

See https://forum.cloudron.io/post/83924