[#55909334] Make all machine install rbenv and the version of ruby we want.
[#55909334] Make all machine install rbenv and the version of ruby we want.

boffbowsh/ci-puppet,boffbowsh/ci-puppet,boffbowsh/ci-puppet,alphagov/ci-puppet,boffbowsh/ci-puppet,alphagov/ci-puppet,alphagov/ci-puppet,alphagov/ci-puppet