Update settings.py

Closes DIAGNijmegen/rse-grand-challenge-admin#801

Author: jmsmkn

app/config/settings.py

@@ -1406,6 +1406,7 @@ def get_private_ip():
     "lw.edu.kg",
     "edumail.edu.pl",
     "zorrag.com",
+    "sis.hust.edu.vn",
     *blocklist,
 }