feat: manage postgres-credentials for artifactapi3 (#194)

pull credentials for postgres/cnpg from vault

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Co-authored-by: Ben Vincent <ben@unkin.net>
Reviewed-on: #194

apps/base/artifactapi/cnpg_cluster.yaml

@@ -15,7 +15,7 @@ spec:
       localeCollate: C
       owner: artifacts
       secret:
-        name: postgres-password
+        name: postgres-credentials
   enablePDB: true
   enableSuperuserAccess: false
   failoverDelay: 0