I'm gonna give shuru a try. My main concern is being based on Alpine (seemingly the only option?) I may not be able to easily pull in the dependencies for the projects I'm working on, but I'll see how it goes.
I would want the equivalent of the trixie-slim Docker image (Debian 13, no documentation). It's ~46 Mb instead of ~4Mb as a Docker image, but gives a reasonably familiar interface.
(This is largely based on some odd experiences with Elixir on Alpine, which is where I am doing most of my work these days.)