postgres: add attic db

postgres/config/clusters/main.yaml

@@ -60,6 +60,12 @@ spec:
       login: true
       passwordSecret:
         name: netmaker-auth
+    - name: attic
+      ensure: present
+      comment: attic
+      login: true
+      passwordSecret:
+        name: attic-auth
     - name: pooler
       ensure: present
       comment: pooler