Make php_cli_server_pdeathsig.phpt SKIPIF more specific

Author: iluuu1994

sapi/cli/tests/php_cli_server_pdeathsig.phpt

@@ -8,8 +8,7 @@ include "skipif.inc";
 if (!(str_contains(PHP_OS, 'Linux') || str_contains(PHP_OS, 'FreeBSD'))) {
     die('skip PDEATHSIG is only supported on Linux and FreeBSD');
 }
-// This fails on 32-bit GitHub actions (probably due to Docker rather than 32-bit)
-if (PHP_INT_SIZE != 8) die("skip 64-bit only");
+if (@file_exists('/.dockerenv')) die("skip Broken in Docker");
 ?>
 --FILE--
 <?php