Ignore domain when there is no endpoint

Prevents this error, when you know what you're doing:

    Error: failed to update DNS records pointing to caddy service: create cluster domain records in Uncloud DNS: rpc error: code = Unknown desc = Post "/domains/ctrl.u.science.ru.nl/records": unsupported protocol scheme ""

Signed-off-by: Miek Gieben <miek@miek.nl>

internal/machine/cluster/dns.go

@@ -153,6 +153,10 @@ func (c *Cluster) CreateDomainRecords(
 		return nil, err
 	}
 
+	if domain.Endpoint == "" { // uc dns set has set a name
+		return &pb.CreateDomainRecordsResponse{}, nil
+	}
+
 	dnsClient := dns.NewClient()
 	recordsReq := make([]dns.RecordRequest, len(req.Records))
 	for i, r := range req.Records {