CI: Use envvars to configure bundler in gems template
What does this MR do and why?
Follow-up of !125322 (merged).
See self-review comments for more context.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Peter Leitzen