title: How do I add API keys and other secure stuff to heroku?
body: <p>I read somewhere but cannot seem to find where to add secret keys into Heroku without needing to put it into the source code git repository?</p>
  
  <p>I guess that helps keep it secure when I am pushing into github.</p>
  
  <p>How do I do that and does that make sense to do?</p>