Document best practices about YAML reusable code
What does this MR do and why?
Related to #31646 (closed)
Add best practices section for when to use extends:, YAML anchors and !reference in CI/CD pipelines.
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 David Dieulivol