I just merged this PR  that makes the setup from the command line happen. You'll find more details about how this is supposed to work in the README  for the CLI based setup.
I kindly ask for your help in testing that program. I'm only a single developer with his developer requirements, but you people will (hopefully) use that program as well. Does it work on you machine? In your scenario? For your configuration? I also only own a limited number of ILIAS installations I can run the update on. Please check (in a safe testing environment, of course) if your existing installations can be updated with the program. Does it stop somewhere? Is there something unexpected happening? Does it break your installation?
I'm looking forward to your reports in our issue tracker . Please make sure you describe your scenario and your problem in some detail, the innards of the setup can be delicate and hard to fix at times and any information will help.
Please be aware that this is (hopefully) only the beginning of that program. If you want to participate in the further development of the setup in the next release, please reach out to me, I would be glad to get more contributors.
If you have any feedback or questions, feel free to contact me as well.