add 'X-KernelTest-Commit' in the stable-rc mail header

Hey Greg, Sasha,


We are doing some work to further automate stable-rc testing, triage, validation and reporting of stable-rc branches in the new KernelCI system. As part of that, we want to start relying on the X-KernelTest-* mail header parameters, however there is no parameter with the git commit hash of the brach head.

Today, there is only information about the tree and branch, but no tags or commits. Essentially, we want to parse the email headers and immediately be able to request results from the KernelCI Dashboard API passing the head commit being tested.

Is it possible to add 'X-KernelTest-Commit'?

Thank you.

- Gus


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Gustavo Padovan
Kernel Lead 

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