Elastic Beanstalk - Rails - Sidekiq - logging permission

I have successfully deployed a Rails app to Elastic Beanstalk. To run sidekiq I have used this - http://ift.tt/1LAfnIk.

I am facing a problem where, I am using this gem - PubNub - http://ift.tt/1gzHnOm which logs to a file in log/pubnub.log.

Now Sidekiq runs as root user & Passenger runs as webapp user. Im using PubNub both in Sidekiq and in the web app.

Sidekiq happened to create the log file first and thus created it as a root user.

When the web app ran by passenger tried to write to this file, its being denied.

Is there anyway to run sidekiq as the webapp user?

Thanks!