title: "Host key verification failed" during docker alpine 9 build
body: <p>I'm trying to clone a private git repo and am running into this error:</p>
  
  <pre><code>npm ERR! Host key verification failed.
  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.
  npm ERR!
  npm ERR! exited with error code: 128
  </code></pre>
  
  <p>Looks like I need to  add the git host to the <code>known_hosts</code> file. However, this version of alpine from Docker does not have a <code>~/.ssh/known_host</code>  file. </p>
  
  <p>the <code>/etc/ssh/</code> is present.</p>