Add variables/secrets best practices usage
Ref: #408462 (closed)
What does this MR do and why?
This MR explains best practices when using CI variables or secrets.
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 Max Orefice