Figure out target-board from compile spec

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[DomainsOnly] Jobs fail with GLIBC version not found

:x: 1 New Failure

As of commit 81147b6396a0bf008e4e4a0da4ed26ff8b40af6c with merge base 270d0558cecba173f5bc5a667124a79c6258054a ():

NEW FAILURE - The following job has failed:

* [pull / unittest / macos / macos-job](https://hud.pytorch.org/pr/pytorch/executorch/7009#33330337698) ([gh](https://github.com/pytorch/executorch/actions/runs/11956182012/job/33330337698)) `RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1`

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pytorch / executorch