use rbenv+ruby-build instead of rvm #110
Merged
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While working on #75 I found that RVM has issues on Alpine, specifically rvm/rvm#5255
Now, while we could probably use another musl-based image (and not Alpine specifically, since the RVM problem is really related to Alpine's use of busybox), I will point out that ruby-build appears to be more actively maintained than rvm, is simpler, and is a bit easier to work with. So I think this is a good change regardless (pending green tests).
Changes:
rvm
no longer exists, replaced byrubyuser
rvm
has been replaced byrbenv
andruby-build
Also in this PR, I've updated the predefined user and group lists to be the superset of all our images.