title: Laravel Spark Upgrade to 6 Causing github access errors
body: <p>I upgraded laravel spark to version six and connected to the github repo on the site. Everything seemed to go OK on the npm install command, but when I ran the npm run dev, I got a slew of errors that basically told me that things related to spark were not found. Seems to be related to the new mix stuff? Do I need a new github token?</p>
  
  <pre><code>These dependencies were not found:
  * auth/register-braintree in ./resources/assets/js/spark-components/auth/register-braintree.js
  * auth/register-stripe in ./resources/assets/js/spark-components/auth/register-stripe.js
  * kiosk/add-discount in ./resources/assets/js/spark-components/kiosk/add-discount.js
  ....
  </code></pre>
  
  <p>It suggested that I install these dependencies but running those commands resulting in an error that seems like I am being denied access to the github repo.</p>
  
  <pre><code>Error while executing:
  npm ERR! /usr/bin/git ls-remote -h -t ssh://git@github.com/auth/register-braintree.git
  npm ERR! 
  npm ERR! Warning: Permanently added the RSA host key for IP address '192.30.253.113' to the list of known hosts.
  npm ERR! Permission denied (publickey).
  npm ERR! fatal: Could not read from remote repository.
  npm ERR! 
  npm ERR! Please make sure you have the correct access rights
  npm ERR! and the repository exists.
  </code></pre>
  
  <p>I bet that there is a connection on github somewhere that I am missing. I connected to the repo on the site ...</p>