title: Yarn not in path on Laradock worskpace when using it in inline docker exec command
body: <p>I have a problem using Laradock and yarn with an inline <code>docker exec</code> command from "outside" the <code>workspace</code> container.</p>
  
  <p>When I use it from inside the <code>workspace</code> container, everything is working as expected :</p>
  
  <pre><code>docker exec -it --user=laradock laradock_workspace_1 bash
  yarn -v
  1.3.2
  </code></pre>
  
  <p>When I try to use it from an inline command, here is what happens :</p>
  
  <pre><code>docker exec -it --user=laradock laradock_workspace_1 yarn -v
  OCI runtime exec failed: exec failed: container_linux.go:296: starting container process caused "exec: \"yarn\": executable file not found in $PATH": unknown
  </code></pre>
  
  <p>Am I doing anything wrong ?</p>