Add m1 mac to CI

[tjammer]

Reported on discord.

We might be able to add this build to actions using an m1 runner. setup-ocaml should have support for it, according to

https://github.com/ocaml/setup-ocaml/pull/536

and

https://github.com/rescript-lang/rescript-compiler/pull/5415/files. This would allow me to debug the issue as I don't have a m1 machine

[tjammer]

As reported on issue #39, building is possible in general. I'll repurpose this ticket to add a m1 build to the ci