Add cosign template
What does this MR do and why?
Add a new example CI template for signing Docker images with cosign.
Tested with: bwill/container-signing!2 (merged)
Relates to: #415610 (closed)
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 Brian Williams