set unique session cache location for each phpunit run

Author: simonLeary42

test/phpunit-bootstrap.php

@@ -15,6 +15,9 @@
 require_once __DIR__ . "/../resources/lib/UnityRedis.php";
 require_once __DIR__ . "/../resources/lib/UnityGithub.php";
 
+session_save_path(exec("mktemp -d"));
+error_log(session_save_path());
+
 global $HTTP_HEADER_TEST_INPUTS;
 $HTTP_HEADER_TEST_INPUTS = [
     '',