Migrate {anonticket, gitlab}.onionize.space to TPO infrastructure

Before I went AFK during most of last year, we had some discussions about moving the anonticket and Gitlab sign-up portal moved to TPO infrastructure eventually. We didn't deem it urgent as it was just to test things, but now the system have been running "fine" for something around 9 months, and I can happily say the administration burden of running this have been so minimal that I can't remember having done anything since I set it up.

The two application are for simplification reasons currently running with sqlite as its database as the number of data records are usually trimmed in there by the moderators, but I think when we move it over we should switch to postgresql for backup reasons and generally maintainability.

The applications are written in Python 3 using the Django framework. I have not tested them with the Debian packages of Django, but it is instead using "what Pip brought me of the day".

This is by no means urgent, but let's keep it on our radar.

What would be the first steps to get this going?

(I don't know which label this belongs to, so leaving it entirely untriaged here)