Upgrading issues.
I didn't know how to roll back the docker to the older repo, so i made a fresh install with the newest repo and then added my old data-folder to the new install.
Now I am on the latest repo, and my Wiki-site is all there.
However, since I only ported my data-folder and nothing else: plugins gone, config gone, themes gone, users gone.
For me, this payoff is fine. I only had two users, and had only installed one plugin - the pages I had made was the important thing and what I had spent most of my time on.