Related issue: https://github.com/thoughtbot/administrate/issues/1774
This is a quick-and-dirty experiment to see if Appraisal is the reason that CI builds don't seem to be caching bundled gems.
The intention is not to remove Appraisal - just to get some information to debug the builds. An attempt has been made to cache Appraisal's dependencies here: https://github.com/thoughtbot/administrate/pull/1549