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-router/tasks/main.yml

@@ -15,6 +15,7 @@
   template:
     src: kubeconfig.yml.j2
     dest: /var/lib/kube-router/kubeconfig
+    mode: 0644
     owner: kube
   notify:
     - reset_kube_router
@@ -42,6 +43,7 @@
   template:
     src: cni-conf.json.j2
     dest: /etc/cni/net.d/10-kuberouter.conflist
+    mode: 0644
     owner: kube
   notify:
     - reset_kube_router
@@ -55,5 +57,6 @@
   template:
     src: kube-router.yml.j2
     dest: "{{ kube_config_dir }}/kube-router.yml"
+    mode: 0644
   delegate_to: "{{ groups['kube_control_plane'] | first }}"
   run_once: true