Add workshop door opening support

Also changes group access checking

inventory-app/templates/doorboy.html

@@ -8,8 +8,8 @@
       <li><a class="waves-effect waves-light btn" href="/m/doorboy/grounddoor/open">Ground door</a> the one on street level facing KBFI</li>
       <li><a class="waves-effect waves-light btn" href="/m/doorboy/frontdoor/open">Front door</a> the one from ground door 5 floors upward</li>
       <li><a class="waves-effect waves-light btn" href="/m/doorboy/backdoor/open">Back door</a> on 5th floor on the Pancake cafeteria side. Note: ground door on cafeteria side is open whenever the cafeteria is open. Other times use the ground door listed above.</li>
+      <li><a class="waves-effect waves-light btn {% if not workshop_access%}disabled{%endif%}" href="/m/doorboy/workshopdoor/open">Workshop door</a> also known as the dirty room</li>
       <!--
-      <li>Coming soon: <a class="waves-effect waves-light btn" href="/m/doorboy/workshop/open">Workshop door</a> also known as the dirty room</li>
       <li>Coming later: <a class="waves-effect waves-light btn" href="/m/doorboy/server/open">Server room door</a></li>
       -->
     </ul>