Fix risky-file-permissions (#8370)

When running ansible-lint directly, we can see a lot of warning
message like

  risky-file-permissions File permissions unset or incorrect

This fixes the warning messages.

roles/kubernetes-apps/ansible/tasks/etcd_metrics.yml

@@ -3,6 +3,7 @@
   template:
     src: "{{ item.file }}.j2"
     dest: "{{ kube_config_dir }}/{{ item.file }}"
+    mode: 0644
   with_items:
     - { file: etcd_metrics-endpoints.yml, type: endpoints, name: etcd-metrics }
     - { file: etcd_metrics-service.yml, type: service, name: etcd-metrics }