How to enable CORS plugin on K8S and dbless kong

@arvtiwar Please do not cross-post. It leaves threads hanging in the forum and the maintainers have a hard time navigating all the notifications. If you post once, please have patience and someone will get back to you as soon as they can.

Regarding this:

What problem did you run into? That looks correct on the face of it.
The general guidelines is that you should take the config part of the plugin configuration from the docs site and then change it to YAM format under the config property of KongPlugin resource.