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Another note, NixOS containers with systemd-nspawn cpmpatibility: https://nixos.wiki/wiki/NixOS_Containers

There is a good blog post here about how these work: https://www.tweag.io/blog/2020-07-31-nixos-flakes/

And of course, it is just a tarball, so it works on every systemd based distro.

There's also this:

"Not-OS – NixOS-based OS generator that outputs an OS with 47MB squashfs":

For memory constrained VMs and containers based on NixOS...

Of course, even that isn't as small as Alpine's absolutely tiny 5MB Docker image: