First of: It has been some time since I last installed Docker. It actually was on Ubuntu and a properly current version was not in the distro repositories, so I had to add a new repository and it installed plenty of extra dependencies. It's not hard, but also not really pleasant.

It also seems like Docker is now able to run rootless as well, so my nitpicks are actually more minor than I originally thought. It's still not daemonless, but it would work for my use case still I think.