heroku not deploying code example

Example 1: deploy to heroku

$ git add .
$ git commit -m "Added a Procfile."
$ heroku login
Enter your Heroku credentials.
...
$ heroku create <app-name>
Creating arcane-lowlands-8408... done, stack is cedar
// now create procfile
//
//node app.js
// 
$ git push heroku master
-----> Node.js app detected
...
-----> Launching... done
       http://arcane-lowlands-8408.herokuapp.com deployed to Heroku

Example 2: push heroku

$ git push heroku master

Example 3: how to trigger new heorku build without diting git

heroku builds:create --source-url https://user:[email protected]/repos/<username>/<repo name>/tarball/master/ --app <app-name>