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

pull credentials for postgres/cnpg from vault

---------

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

apps/base/artifactapi/vaultstaticsecret.yaml

@@ -32,3 +32,20 @@ spec:
   refreshAfter: 5m
   type: kv-v2
   vaultAuthRef: default
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: postgres-credentials
+  namespace: puppet
+spec:
+  destination:
+    create: true
+    name: postgres-credentials
+    overwrite: true
+  hmacSecretData: true
+  mount: kv
+  path: service/artifactapi/postgres-credentials
+  refreshAfter: 5m
+  type: kv-v2
+  vaultAuthRef: default