WIP: Debug gdk doctor

What does this Merge Request do?

This WIP MR exists in order to debug why gdk doctor, only when running under CI returns:

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Please note these warning only exist for debugging purposes and can
help you when you encounter issues with GDK.
If your GDK is working fine, you can safely ignore them. Thanks!
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Ruby Gems
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The following Ruby Gems have issues:
charlock_holmes
eventmachine
ffi
pg
Try running the following to fix:
gem pristine charlock_holmes eventmachine ffi pg
re2
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It looks like your system re2 library may have been upgraded, and
the re2 gem needs to be rebuilt as a result.
Please run `gem pristine re2`.

e.g. https://gitlab.com/gitlab-org/gitlab-development-kit/-/jobs/652259596#L6227

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.