CI: allow lint:api-merge-diff to fail if CI_MERGE_REQUEST_TARGET_BRANCH_SHA is missing
Description
CI_MERGE_REQUEST_TARGET_BRANCH_SHA
might be missing in some cases (private fork??) in which case just skip the ABI check. Code owners can still check ABI changes manually in diff and request changes.
API Changes and Justification
Backwards Compatible Changes
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This change does not modify any class/function/struct/type definitions in a public C header file or any Python class/function definitions -
This change adds new classes/functions/structs/types to a public C header file or Python module
Backwards Incompatible Changes
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This change modifies an existing class/function/struct/type definition in a public C header file or Python module -
This change removes an existing class/function/struct/type from a public C header file or Python module
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.
Review Status
Please provide details on any reviews related to this change and and the associated reviewers.