chore(backstage): Added database and secrets for backstage

manifests/artemis/backstage/db-cluster.yaml

@@ -2,22 +2,21 @@ apiVersion: postgresql.cnpg.io/v1
 kind: Cluster
 metadata:
   name: backstage-postgres
-  namespace: backstage
 spec:
-  imageName: ghcr.io/tensorchord/cloudnative-pgvecto.rs:16.5-v0.3.0@sha256:be3f025d79aa1b747817f478e07e71be43236e14d00d8a9eb3914146245035ba
   instances: 1
-  managed:
-    roles:
-      - name: backstage
-        superuser: true
-        login: true
+  imageName: ghcr.io/cloudnative-pg/postgresql:16
+  enableSuperuser: true
+
+  storage:
+    size: 2Gi
+    storageClass: local-path
+
   bootstrap:
     initdb:
       database: backstage
       owner: backstage
       secret:
         name: backstage-postgres-user
-
-  storage:
-    size: 2Gi
-    storageClass: local-path
+      # Ensure the 'backstage' role can login and is a superuser
+      postInitSQL:
+        - ALTER ROLE backstage WITH SUPERUSER LOGIN;