If on your distribution (eg. SteamOS) can be difficult to install something and keep it
between updates, then you could use this guide to install
podman in your
sudo touch /etc/subuid /etc/subgid
sudo usermod --add-subuid 100000-165535 --add-subgid 100000-165535 $USER
This is particularly indicated also for completely sudoless setups, where you don’t have any superuser access to the system, like for example company provided computers.
Download the latest release of podman-launcher, make it executable and put it somewhere in your $PATH
Provided the only dependency on the host (
newuidmap/newgidmap, of the package
you should be good to go.
To uninstall, just delete the binary.