Skip test-sysroot.js on s390x

Mitigates: #1025532

debian/tests/flaky-concurrency

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -e
+exec 2>&1
+
+# Ubuntu provides internet access via a proxy, but libostree doesn't need
+# that. However, libostree also doesn't support no_proxy, so it will try
+# to use Ubuntu's proxy for localhost, and fail to reach itself.
+unset ftp_proxy
+unset http_proxy
+unset https_proxy
+unset no_proxy
+
+exec gnome-desktop-testing-runner libostree/test-concurrency.py.test