Update gitlab.yml.example
What does this MR do?
Explains the problem instead of Yelling.
The relevant part that fails is in gitlab-shell: https://gitlab.com/gitlab-org/gitlab-shell/blob/v3.6.6/hooks/post-receive#L8
Are there points in the code the reviewer needs to double check?
No
Why was this MR needed?
It's better explain the problem than YELL.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together