Fix slow gitaly dev test bundle
What does this MR do?
Fix the recent slow-down of Gitaly's bundle install when running tests in development.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
We changed the options passed to bundle install inside Gitaly's Makefile recently.
Screenshots (if relevant)
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