Do you have a link to the year-old info for context? I’m curious why people would be interested in federation of a DVCS like Gitea et al?

Echoing the sentiment that you should adjust your perspective in approaching containerization, otherwise you’re in for a tough time.

Jerome Petazzoni, one of the more recognizable names in the container community, has a site where he puts all of his workshops, slides, etc. This is his one for getting started with Docker.