how to build before deploying in herouko github code example

Example 1: deploying to heroku from git

$ heroku git:remote -a thawing-inlet-61413
set git remote heroku to https://git.heroku.com/thawing-inlet-61413.git

Example 2: deploying to heroku from git

$ git push heroku master
Initializing repository, done.
updating 'refs/heads/master'
...