Kinda surprising that this doesn't support Linux.

Podman can transparently start microVMs instead of local containers via libkrun as well, which does support Linux: https://josecastillolema.github.io/podman-wasm-libkrun/

I work on Docker Sandboxes. We do support Linux with the newer standalone version (sbx), see here: https://docs.docker.com/ai/sandboxes/