feat(postgres): run ha postgres cluster

manifests/postgres/postgres.yaml

@@ -6,7 +6,7 @@ metadata:
     argocd.argoproj.io/sync-wave: "10"
 spec:
   imageName: ghcr.io/cloudnative-pg/postgresql:16.2
-  instances: 1
+  instances: 2
   primaryUpdateStrategy: unsupervised
   primaryUpdateMethod: switchover
   superuserSecret:
@@ -34,7 +34,14 @@ spec:
   postgresql:
     parameters:
       max_connections: "500"
-      # max_slot_wal_keep_size: "10GB"
-      # wal_keep_size: "5GB"
+      max_slot_wal_keep_size: "1GB"
+      wal_keep_size: "1GB"
+  # High Availability configuration
+  minSyncReplicas: 0
+  maxSyncReplicas: 1
+  # Enable replication slots for HA in the cluster
+  replicationSlots:
+    highAvailability:
+      enabled: true
   # monitoring:
   #   enablePodMonitor: true