title: Rails: How to put stuff in header
body: <p>In my Rails App I included OneSignal which requires the following link to be placed in the head of the document:</p>
  
  <pre><code>&lt;link href='/manifest.json' rel='manifest'&gt;
  </code></pre>
  
  <p>Unfortunately with Rails I cannot put this link there, because the entire layout gets rendered inside the body.</p>
  
  <p>While this ...</p>
  
  <pre><code>$(document).ready(function(){
      $("head").append("&lt;link href='/manifest.json' rel='manifest'&gt;");
  });
  </code></pre>
  
  <p>seems to work in development mode, it does not work in production.</p>
  
  <p>How can I add this link to my head section of the document?</p>