add uidmap in order to use rootless docker

Found out there's a rootless way of running docker, but we're missing uidmap and maybe iptables.

https://docs.docker.com/engine/security/rootless/

Interesting!

Iptables are quite outdated nowdays, looking into nftables would be more productive I think.

Also, I'm wondering what usecase you have in mind. Is it to run programs in an isolated-development environment or is it to have long-running services in containers?

Primarily the latter, mostly to learn more about docker containers and also the convenience of being "sysadmin" of those containers you create. Feels less messy compared to building packages you want in your home dir and exporting them to path.