config: fix format

Author: Zash

config/schemas/config.yaml

@@ -342,7 +342,7 @@ properties:
           and to reach user facing services such as Grafana, Harbor and OpenSearch Dashboards.
           E.g. with 'prod.domain.com', OpenSearch Dashboards is reached via 'opensearch.prod.domain.com'.
         type: string
-        format: dns-domain-name
+        format: hostname
       opsDomain:
         description: |-
           Domain intended for ingress usage in the service cluster and to reach