Bump Gitlab Shell to v6.0.4
What does this MR do?
Update Gitlab Shell to v6.0.4
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
This Shell version includes a fix to make the GL_REPOSITORY env variable available to custom hooks
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together -
Internationalization required/considered -
End-to-end tests pass ( package-qamanual pipeline job)