Rewrite logic for when user cleaner is started

app/workers/user_cleaner.rb

@@ -6,7 +6,7 @@ def perform
     # Note that Rails.env.production? is not sufficient in this context
     # as both mampf-experimental and mampf-dev also run in production mode.
     production_name = ENV.fetch("PRODUCTION_NAME", nil)
-    return if ["mampf-experimental", "mampf-dev"].include?(production_name)
+    return unless production_name == "mampf"
 
     UserCleaner.new.handle_inactive_users!
   end