Add new daily job to clean cache in public/tmp (as suggested in #5946).

Changelog.md

@@ -14,6 +14,7 @@
 ## Features
 * Add configuration options for some debug logs [#6090](https://github.com/diaspora/diaspora/pull/6090)
 * Send new users a welcome message from the podmin [#6128](https://github.com/diaspora/diaspora/pull/6128)
+* Cleanup temporary upload files daily [#6147](https://github.com/diaspora/diaspora/pull/6147)
 
 # 0.5.1.2
 

app/workers/clean_cached_files.rb

+module Workers
+  class CleanCachedFiles < Base
+    include Sidetiq::Schedulable
+
+    sidekiq_options queue: :maintenance
+
+    recurrence { daily }
+
+    def perform
+      CarrierWave.clean_cached_files!
+    end
+  end 
+end