Allow build to be bumped to the front of the queue via the web interface

Builds now have a "Bump up" action. This will cause the queue runner
to prioritise the steps of the build above all other steps.

src/lib/Hydra/Controller/Root.pm

@@ -88,7 +88,7 @@ sub queue_GET {
     $c->stash->{flashMsg} //= $c->flash->{buildMsg};
     $self->status_ok(
         $c,
-        entity => [$c->model('DB::Builds')->search({finished => 0}, { order_by => ["id"]})]
+        entity => [$c->model('DB::Builds')->search({finished => 0}, { order_by => ["globalpriority desc", "id"]})]
     );
 }