feat(postgres): deploy connection pooler

cnpg/kustomization.yaml

@@ -7,6 +7,7 @@ resources:
   - resources/secrets/cnpg-backup-creds.yaml
   - resources/cluster.yaml
   - resources/backup.yaml
+  - resources/pool.yaml
 
 helmCharts:
   - releaseName: cnpg

cnpg/resources/pool.yaml

@@ -0,0 +1,15 @@
+apiVersion: postgresql.cnpg.io/v1
+kind: Pooler
+metadata:
+  name: app-cluster-rw
+spec:
+  cluster:
+    name: app-cluster
+
+  instances: 3
+  type: rw
+  pgbouncer:
+    poolMode: session
+    parameters:
+      max_client_conn: "1000"
+      default_pool_size: "10"