Revert "Remove longhorn"

This reverts commit 183b384366.

clusters/kairos/longhorn/ingress.yaml

@@ -0,0 +1,16 @@
+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