management: add possibility to limit cron to a single application (#28040)

combo/data/management/commands/cron.py

@@ -33,6 +33,8 @@ class Command(BaseCommand):
         for appconfig in apps.get_app_configs():
             if not hasattr(appconfig, 'hourly'):
                 continue
+            if options.get('application') and appconfig.name != options.get('application'):
+                continue
             if hasattr(appconfig, 'is_enabled') and not appconfig.is_enabled():
                 continue
             try: