Documentation for running CI/CD pipelines on a schedule

Create docs for:

• Issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/2989
• MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10133

@axil I don't know if we will have anything ~Frontend facing.

MEMO: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10133#note_26766077 should be explained

@ayufan ok, then how will this feature be testable to the users? :)

Is https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10133 the MVP which lays the ground for the feature to be complete on 9.2+? If no docs are required for 9.1, can you move the milestone please? Thanks!

Rather than having a separate issue, I'll close this one and add the docs-missing label to the original issue.

closed

@axil Since https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10533 merged into master and will happen in 9.1, I think a documentation is needed for this experimental feature. I'd like to create an MR for base lines, and then could you review/revise it?

/cc @ayufan

@dosuken123 yes, please go ahead :)

mentioned in merge request !10591 (merged)

mentioned in commit dinsaw/gitlab-ce@9d1ce06e

mentioned in commit c132b29e