Run bundle install after checking out $CI_COMMIT_SHA
What does this MR do?
Fix the migration paths
CI job following this comment: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10047#note_25966342
I've enabled the job in the original commit (now rebased) to ensure that the fix was working: https://gitlab.com/gitlab-org/gitlab-ce/pipelines/7186588/builds