changes for ip propagation and configurable storage class

[Wissiak]

This PR includes two changes:

1. StorageClass per app

• Allows selecting local-path or longhorn per app in the UI
• Default stays longhorn
• Prevents DBs from failing on VPS setups where Longhorn block storage is unreliable

2. Client IP propagation via UI

• Adds a UI toggle to enable Traefik externalTrafficPolicy: Local
• Automatically patches the Traefik Service and restarts the deployment
• Removes the need for manual kubectl edit steps

A comment on 2: I wanted to obtain the IP address of users that visited my website from inside an app and to achieve this, I had to perform the underneath steps which now should be integrated into QuickStack and be persisted:

kubectl edit svc traefik -n kube-system
kubectl rollout restart deployment traefik -n kube-system
kubectl get pods -n kube-system -w | grep traefik
-> set externalTrafficPolicy: Local

[vercel]

@Wissiak is attempting to deploy a commit to the biersoeckli Team on Vercel.

A member of the Team first needs to authorize it.

[biersoeckli]

@Wissiak both of these features should ONLY be used in a single-node cluster. I restricted the use of local-path volumes in a multi-node cluster and added some notes on the traefik externalTrafficPolicy=local setting. If externalTrafficPolicy=local is set in a multi-node cluster the traffic may never reach the pod if traefik and the target pod are on different nodes.