Merge branch 'jc/ci-print-test-failures-fix'

CI fix.

* jc/ci-print-test-failures-fix:
  ci: allow github-actions print test failures again

Author: gitster

ci/print-test-failures.sh

@@ -41,7 +41,7 @@ do
 		case "$CI_TYPE" in
 		github-actions)
 			mkdir -p failed-test-artifacts
-			echo "FAILED_TEST_ARTIFACTS=${TEST_OUTPUT_DIRECTORY:t}/failed-test-artifacts" >>$GITHUB_ENV
+			echo "FAILED_TEST_ARTIFACTS=${TEST_OUTPUT_DIRECTORY:-t}/failed-test-artifacts" >>$GITHUB_ENV
 			cp "${TEST_EXIT%.exit}.out" failed-test-artifacts/
 			tar czf failed-test-artifacts/"$test_name".trash.tar.gz "$trash_dir"
 			continue