title: Can I use Config Vars in templates?
body: <p>I have a Rails app deployed on Heroku.</p>
  
  <p>If I set the following var <code>PRODUCTION_ENV: true</code>, is it possible to check for it in code, i.e.</p>
  
  <pre><code>&lt;% PRODUCTION_ENV == true %&gt;
  </code></pre>