Revert "Remove longhorn"

This reverts commit 183b384366.

clusters/kairos/longhorn/ingress.yaml

@@ -1,16 +0,0 @@
-apiVersion: traefik.io/v1alpha1
-kind: IngressRoute
-metadata:
-  name: longhorn
-spec:
-  entryPoints:
-    - web
-  routes:
-  - match: Host(`longhorn.k3s`)
-    kind: Rule
-    services:
-    - name: longhorn-frontend
-      namespace: longhorn-system
-      nativeLB: true
-      kind: Service
-      port: 80