Make user mentions great again

app/ServiceProvider/JobProvider.php

@@ -10,6 +10,7 @@ use Kanboard\Job\SubtaskEventJob;
 use Kanboard\Job\TaskEventJob;
 use Kanboard\Job\TaskFileEventJob;
 use Kanboard\Job\TaskLinkEventJob;
+use Kanboard\Job\UserMentionJob;
 use Pimple\Container;
 use Pimple\ServiceProviderInterface;
 
@@ -62,6 +63,10 @@ class JobProvider implements ServiceProviderInterface
             return new ProjectMetricJob($c);
         });
 
+        $container['userMentionJob'] = $container->factory(function ($c) {
+            return new UserMentionJob($c);
+        });
+
         return $container;
     }
 }