add postgres installation

fleet.yaml

 defaultNamespace: database
 helm:
-  releaseName: postgresql-ha
+  releaseName: postgresql
   repo: https://charts.bitnami.com/bitnami
-  chart: postgresql-ha
-  version: 11.9.3
+  chart: postgresql
+  version: 12.11.1
   values:
-    pgpool:
-      customUsersSecret: "pgpool-customusers"
-      existingSecret: "pgpool-auth"
+    auth:
+      existingSecret: "postgresql-auth"
+    primary:
       nodeSelector:
         worker: "true"
       podAnnotations:
         proxy.istio.io/config: '{ "holdApplicationUntilProxyStarts": true }'
-      replicaCount: 3
-    postgresql:
-      existingSecret: "postgresql-ha-auth"
-      nodeSelector:
-        worker: "true"
-      podAnnotations:
-        proxy.istio.io/config: '{ "holdApplicationUntilProxyStarts": true }'
-      replicaCount: 3
 dependsOn:
   - name: istio
   - name: cinder-csi