Fix gitlab-rails-* jobs gems chacing
One of the last thing we changed in !322 (comment 258929112) was to remove the folder that would be cached before extracting it from the image.
Before that change, the gems were cached: https://gitlab.com/gitlab-org/build/CNG/-/jobs/374643245
After that change, we'd get a WARNING: gitlab-rails/vendor/bundle: no matching files warning: https://gitlab.com/gitlab-org/build/CNG/-/jobs/376540168
I think this might be because the folder structure needs to exists before we extract the gems from the image...
Edited by Rémy Coutable