Hi Markus,
I've just got Trapper-Project running on an Ubuntu 20.04 VM (running on a synology NAS). I followed the instructions at
trapper...@googlegroups.com. I had a few problems, especially with the nginx processing not starting and the createsuperuser taking a very long time to start running.
I'm interested that you're starting docker-compose manually, rather than using the start.sh script. Is there a particular reason for that?
Otherwise, I might be able to help a little. I'm really replying to give you hope that it is possible to get Trapper working.
Cheers and Happy New Year
Richard