fix cilium routing and cluster dns

ansible/inventory.flatcar-k3d.example.yml

@@ -9,4 +9,11 @@ all:
           ansible_become_method: sudo
           cilium_enabled: false
           cilium_k8s_service_host: REPLACE_WITH_REACHABLE_API_IP
-          cilium_k8s_service_port: 6443
+          # Set to zero for k3d so Ansible derives the published API port from
+          # the kubeconfig created during cluster bootstrap.
+          cilium_k8s_service_port: 0
+          # Optional. Use resolvers reachable from the Flatcar network when
+          # Docker's nested bridge resolver cannot answer external names.
+          # k3d_dns_servers:
+          #   - REPLACE_WITH_PRIMARY_DNS
+          #   - REPLACE_WITH_SECONDARY_DNS