code: func runCoreDNSAddon(c workflow.RunData) error {
  	cfg, client, err := getInitData(c)
  	if err != nil {
  		return err
  	}
  	return dnsaddon.EnsureDNSAddon(&cfg.ClusterConfiguration, client)
  }
docs: // runCoreDNSAddon installs CoreDNS addon to a Kubernetes cluster