ci: fix checking github.event.pull_request.head.sha
#26775
Merged
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Currently, checks like
if [ ${{ github.event.pull_request.head.sha }} != "" ]; then
are resulting in errors ([: !=: unary operator expected
) if the variable is empty. This is the case if the workflow is triggered via push on main (and not via pull_request).This commit fixes this by wrapping it with a string.