[8.14] ci(signed-commits): use GPG signing (backport #13069) #13092
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Motivation/summary
Support signed commits using a GPG linked to the user used for the automation.
I double-checked different alternatives as explained in actions/runner#667
But decided to use a native GitHub action for the sake of simplicity; eventually, we could use the GitHub graphql approach, but I don't know if that behaviour will change in the future. For now, I think it's safer to use the default standard approach.
Checklist
For functional changes, consider:
How to test these changes
Related issues
Part of #12995
This is an automatic backport of pull request #13069 done by Mergify.