Instance-Ingress is being cascade-deleted

[iyannsch]

Hey folks,

I recently noticed that the instance-ingress is deleted when I remove all my AppDefinitions from the respective namespace.

Steps to reproduce:

1. Verify that the ingress (default theia-cloud-demo-ws-ingress) is existent and working
2. Delete all installed AppDefinitions
3. Verify that the ingress is no longer existent

Taking a look at the ownerReferences of the ingress, I can see that all AppDefinitions are listed there. A cascading delete is actually intended functionality judging by the K8s API, right? It still might make sense to stop the ingress from being deleted on accident as getting it back often times includes re-executing the helm chart.

Happy fixing, let me know if I can help 😊
Yannik