We have the option for adding a docker tls cert, but nothing is listed for the CA. With just the cert configured, I get the following error ```autokuma-1 | WARN [kuma_client::util] Using DOCKER_HOST=https://192.168.128.3:2376 autokuma-1 | WARN [autokuma::sync] Encountered error during sync: Cannot open/read certificate with path: /root/.docker/ca.pem```