only run SAPI test

Author: Girgias

.github/actions/test-linux/action.yml

@@ -34,6 +34,7 @@ runs:
         export TEST_PHP_JUNIT=junit.out.xml
         export STACK_LIMIT_DEFAULTS_CHECK=1
         export LSAN_OPTIONS=verbosity=1:log_threads=1
+        export TESTS="sapi/cli/tests/ext_loading.phpt"
         sapi/cli/php run-tests.php -P -q ${{ inputs.runTestsParameters }} \
           -j$(/usr/bin/nproc) \
           -g FAIL,BORK,LEAK,XLEAK \