give permission to application ssh user to create his own ssh key
1. create an app on any server
2. add ssh user to app
3. activate ssh access for app
4. log in as ssh user created
5. try to do ssh-keygen
The user can't write to ~/.ssh which is a problem.
I can't give a partner en environment with git enabled to push / pull from a remote origin.
Only work around now is to fire up a new server instance or give everyone master credentials.