feat: add longhorn storage and documentation

infrastructure/longhorn-config-app.yaml

@@ -0,0 +1,20 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: longhorn-config
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "2" # Nach Longhorn Install
+spec:
+  project: default
+  source:
+    repoURL: https://git.cloud-infra.prod.openmailserver.de/stabify/gitops.git
+    targetRevision: HEAD
+    path: infrastructure/longhorn/config
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: longhorn-system
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true