Add rubygems publish job
This creates a rubygems publish job for deploying cinc branded gems. This also
refactors how InSpec gets our patches applied. Instead of doing it via omnibus,
instead use patch
directly during the "patch" stage so that it can be easily
used later in other stages.
This relies on https://gitlab.com/cinc-project/inspec/merge_requests/1 getting approved.
Edited by Lance Albertson