I made a service with Cloud Run for Anthos on Google Cloud, and the SSL certificate is made by Let’s Encrypt.
I want to renew the certificate automatically on serverless, not on GCE.

How can I do that?

Can I use cronJob on GKE? 

I just manually created the certificate on my laptop.

```
sudo certbot certonly --manual --preferred-challenges dns -d '*.default.domain'
sudo kubectl create --namespace istio-system secret tls istio-ingressgateway-certs \
--key /etc/letsencrypt/live/default.domain/privkey.pem \
--cert /etc/letsencrypt/live/default.domain/fullchain.pem

```