Encrypt CI/CD builds tokens / EE
What does this MR do?
This merge requests reintroduces changes from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23436 reverted in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23644 in CE, to EE.
This merge requests reintroduces changes from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23436 reverted in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23644 in CE, to EE.