how to execute rake tasks using whenever gem, in amazon aws server in ruby on rails?

iam using whenever gem to execute a rake task, in my rails application. in development environment everything is working fine this is the following code.

 set :environment, "development"
 set :output, {:error => "log/cron_error_log.log", :standard => "log/cron_log.log"}

 every :day, :at => '12:10pm' do
  runner "Employee.assign_shift_policies"
 end 

and in terminal to create a crontab and to run that cron tab file by using whenever gem iam running the following commands.

 whenever
 whenever -w 

and the tasks are executing correctly. and the output of these rake tasks is appending to the following log files properly.

 log/cron_error_log.log
 log/cron_log.log

in development everthing is working fine. how to run these background jobs in amazon aws beanstalk server, means how to execute these whenever and whenever -w commands in amazon aws server to generate crontab and to execute those jobs in aws server by using elastic beanstalk?