From your AWSCLI instance go to sample_app, open some build scripts.
$ cd /home/ec2-user/sample_app/
$ sudo vim Rakefile
Open the build tasks.
$ cd /home/ec2-user/sample_app/lib/tasks
$ sudo vim sample_data.rake
You can also find these files by going to https://github.com/stelligent/sample_app/blob/master/Rakefile and https://github.com/stelligent/sample_app/blob/master/lib/tasks/sample_data.rake.
Make a modification to the contents of the file and save it.
Add the file in Git
$ git add .
Commit the file to Git
$ git commit -m "Modified deployment script"
Push it to the Git master.
$ git push