https://man.archlinux.org/man/subuid.5.en
https://man.archlinux.org/man/subgid.5.en
https://wiki.gentoo.org/wiki/Subuid_subgid
https://wiki.archlinux.org/title/Podman

https://man7.org/linux/man-pages/man7/user_namespaces.7.html
https://www.baeldung.com/linux/etc-subuid
https://www.funtoo.org/LXD/What_are_subuids_and_subgids%3F
https://man7.org/linux/man-pages/man7/namespaces.7.html
https://rootlesscontaine.rs/getting-started/common/subuid/
https://github.com/containers/podman/blob/main/docs/tutorials/rootless_tutorial.md
    !!! need to read

https://freedium.cfd/https://medium.com/@ByteWaveNetwork/step-by-step-podman-tutorial-36259fad2690
cat /etc/subuid
<usr>:524288:65536

https://github.com/containers/podman/discussions/23934

sudo usermod --add-subuids 100000-165535 --add-subgids 100000-165535 $(id -nu)