add containerd registry mirror certificate configuration (#11857)

Signed-off-by: KubeKyrie <shaolong.qin@daocloud.io>

roles/container-engine/containerd/defaults/main.yml

@@ -62,6 +62,8 @@ containerd_registries_mirrors:
       - host: https://registry-1.docker.io
         capabilities: ["pull", "resolve"]
         skip_verify: false
+#        ca: ["/etc/certs/mirror.pem"]
+#        client: [["/etc/certs/client.pem", ""],["/etc/certs/client.cert", "/etc/certs/client.key"]]
 
 containerd_max_container_log_line_size: 16384