DEV: Allow removing local assets after s3 sync (#14013)

lib/tasks/s3.rake

@@ -37,6 +37,8 @@ def upload(path, remote_path, content_type, content_encoding = nil)
       helper.upload(file, remote_path, options)
     end
   end
+
+  File.delete(path) if (File.exists?(path) && ENV["DELETE_ASSETS_AFTER_S3_UPLOAD"])
 end
 
 def use_db_s3_config