Enhance make-admin to allow making superuser

uncloud_auth/management/commands/make-admin.py

@@ -7,10 +7,15 @@ class Command(BaseCommand):
 
     def add_arguments(self, parser):
         parser.add_argument('username', type=str)
+        parser.add_argument('--superuser', action='store_true')
 
     def handle(self, *args, **options):
         user = get_user_model().objects.get(username=options['username'])
         user.is_staff = True
+
+        if options['superuser']:
+            user.is_superuser = True
+
         user.save()
 
-        print("{} is now admin.".format(user.username))
+        print(f"{user.username} is now admin (superuser={user.is_superuser})")