@fbartels Documentation is the next step. 
What function does it serve that i need to add my Cloudron server in the settings and why does it go via the ip?
Firewall / Proxy. We do not use third-party hubs like Docker Hub. It is our own infrastructure, and we want to get an overview of the (technical) possibilities between accounts/instances and our resources. Besides that, some apps are in a premium tier for which we charge maintenance fees. This workflow is integrated directly into the app catalog.
When installing two apps I am getting and error that it cannot pull from the registry:
Thanks a lot for pointing out this error. That wasn't intentional. I'm opening a ticket for our devs right away (yep: real humans, not AI).
It's worth mentioning: the entire app catalog is still in early beta. 
I see you are using Laravel.
Yes.