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/network_plugin/kube-ovn/tasks/main.yml

@@ -9,6 +9,7 @@
   template:
     src: "{{ item.file }}.j2"
     dest: "{{ kube_config_dir }}/{{ item.file }}"
+    mode: 0644
   with_items:
     - {name: kube-ovn-crd, file: cni-kube-ovn-crd.yml}
     - {name: ovn, file: cni-ovn.yml}