Ignore flaky 32-bit Windows test

Author: iluuu1994

ext/sysvshm/tests/bug72858.phpt

@@ -7,6 +7,7 @@ sysvshm
 
 if (4 < PHP_INT_SIZE) { print "skip 32-bit only"; }
 if (substr(PHP_OS, 0, 3) != "WIN") { print "skip windows only"; }
+if (getenv('GITHUB_ACTIONS')) die('skip on GitHub actions');
 ?>
 --FILE--
 <?php