Feature request - add apps by default

[angelnu]

Great app - considering to replace Homer. I would like to propose a differentiating feature when compared to Homer and similar apps that do not monitor the k8s control plane.

Currently it is necessary to add the forecastle.stakater.com/expose annotation to each ingress. This makes easy to forget adding new applications to forecastle. It also makes it similar to other apps where I have to manually update a list of apps.

I would like to add all ingresses by default so they show up in the dashboard - then I can later on do the tuning such as changing the icon. This way the list is guarantied to include all apps deployed in the cluster without admin intervention.

This might be implemented with an addByDefault Forecastle option which would default to False to follow the current implementation.

It should still be possible to exclude apps by explicitly setting forecastle.stakater.com/expose to False.

[cubic3d]

In case of multiple ingress controllers that would also need an option to filter by class for this feature.