feat(postgres): Add cnpg grafana dashboard as component

ref: #18

manifests/postgres/components/dashboard/GrafanaDashboard-cloudnativepg.yaml

@@ -0,0 +1,17 @@
+---
+apiVersion: grafana.integreatly.org/v1beta1
+kind: GrafanaDashboard
+metadata:
+  labels:
+    app.kubernetes.io/component: database
+  name: cloudnativepg
+spec:
+  allowCrossNamespaceImport: true
+  folder: "General"
+  resyncPeriod: 24h
+  instanceSelector:
+    matchLabels:
+      dashboards: grafana
+  grafanaCom:
+    id: 20417
+    revision: 4     # as @ 2025-08-02

manifests/postgres/components/dashboard/kustomization.yaml

@@ -0,0 +1,7 @@
+---
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+
+
+resources:
+  - GrafanaDashboard-cloudnativepg.yaml

manifests/postgres/overlays/ha/kustomization.yaml

@@ -13,6 +13,7 @@ resources:
 components:
   - ../../components/ha
   - ../../components/metrics
+  - ../../components/dashboard
 
 
 patches: