gitops: add secret-rotation controller ArgoCD Application

- Syncs k8s/apps/secret-rotation-controller/ kustomization
- Auto-prune and self-heal enabled
- Creates secret-rotation namespace
- ArgoCD will deploy CRD, RBAC, ExternalSecret, Deployment

k8s/argocd/apps/08-secret-rotation.yaml

@@ -0,0 +1,32 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: secret-rotation
+  namespace: argocd
+  labels:
+    app.kubernetes.io/name: secret-rotation
+spec:
+  project: homelab
+  
+  sources:
+  - repoURL: https://forgejo.riotpiao.com/rock/homelab.git
+    path: k8s/apps/secret-rotation-controller
+    targetRevision: main
+  
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: secret-rotation
+  
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+    - CreateNamespace=true
+    - RespectIgnoreDifferences=true
+    retry:
+      limit: 5
+      backoff:
+        duration: 5s
+        factor: 2
+        maxDuration: 3m