add app postgresql

kubernetes/apps/postgresql/postgresql.yaml

@@ -0,0 +1,23 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: postgresql
+  namespace: postgresql
+spec:
+  interval: 10m
+  timeout: 1m30s
+  retryInterval: 30s
+  path: ./kubernetes/apps/postgresql/app
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    namespace: flux-system
+    name: flux-system
+  dependsOn:
+    - name: postgresql-secrets
+      namespace: postgresql
+  postBuild:
+    substituteFrom:
+      - kind: Secret
+        name: postgresql-secrets
+