readme update

README.md

@@ -11,6 +11,7 @@ A GitHub Action for running k3s kubernetes cluster
 ## Optional Input parameters
  * k3s_tag - k3s tag to use. (can be found at https://hub.docker.com/r/rancher/k3s/tags)
  * parent_workspace - workspace path on runner, obtainer from context, no need to specify anything here, except you know what you're doing
+ * registries_yaml_path - relative path of registries.yaml
  * kubectl_version
  * install_kubectl - enabled by default, copies kubectl to bin dir in workspace to allow other steps to use kubectl
  * k3s_arguments - by default set to `--no-deploy=traefik`