CI script for GitHub Actions?

[mbarbin]

With the addition of the new dune-workspace files to check the build with different OCaml version, the project is now fairly close to having a automated CI pipeline to check the build during PRs, based on dune-pkg and https://github.com/ocaml-dune/setup-dune/

I started experimenting with one for feather here

There are a few caveats and limitations which we can look into if having a CI like that would interest you for this project (and we can also take an incremental approach until a fully workable CI is in place in a few iterations). Lemme know!