Docker rootless - one masquerading bug to rule them all

Preferbly I use podman, but sometimes you are forced to use docker. Ideally you then switch to docker rootless, because of, well, security. I noticed that the docker rootless installation instructions are not ideal (e.g. contain a bug). Took me a while to figure it out though, but wanted to share. Especially since this might mean, more people (who explicitly want or need to run docker) can run docker safer (rootless).