Change CI_COMMIT_REF to CI_COMMIT_SHA in docs (!1513) · Merge requests · GitLab.org / gitlab-runner · GitLab

The source project of this merge request has been removed.

What does this MR do?

Change CI_COMMIT_REF to CI_COMMIT_SHA in docs

related to #3331 (closed)

/cc @markglenfletcher @erushton