Luckily you can just increase the disk size in google cloud easily!
I tried a lot of stuff. First I deployed using the quick-install method. Then I thought that maybe using the docker approach would fix it.
This did not fix it.
But when you use the docker approach you can run it like this: sudo docker-compose up
You will get a lot of debug information and I just let it run on the side. Out of frustration I just rebooted the virtual machine, did the command again and noticed in super tiny glimpse that rasa-x was complaining about disk space.
So i guess it was just dump luck in my case. Some useful feedback in the front-end would be a better approach 