ci(postgres): Integrate with renovate dependency manager

infrastructure/postgres/release.yaml

@@ -13,6 +13,7 @@ spec:
         name: zalando-postgres-operator
       valuesFiles:
         - values.yaml
+      # renovate: helmRepo=https://opensource.zalando.com/postgres-operator/charts/postgres-operator/ depName=postgres-operator
       version: 1.6.3
   interval: 5m
   values: