I've created packages both for ruby-build and for rbenv.
These two packages can be used as an alternative to rvm to manage ruby versions.
I have created a package request for ruby-build here:
There is at least one bug with rbenv, and it not letting you use the
system ruby, which is why I haven't created a package request for
rbenv, though you can find the spec file here:
I would appreciate it if someone could look through the specs, and
approve the ruby-build request.