Support label selectors

[reegnz]

Is your feature request related to a problem? Please describe.
I want to get all resources limited by a specific label selector.

Describe the solution you'd like
It would be great if ketall would support the "--selector" flag just as kubectl get does.

Describe alternatives you've considered
My alternative is to use "kubectl get" for each api-resource.

Additional context
Some of the kubernetes resources I create with terraform and label them with a custom label, eg. "k8s.example.com/terraform=owned". I want to collect all resources in the cluster that I have created with terraform by using a label selector.

[corneliusweig]

@reegnz Thanks for reporting this. This is definitely something ketall should be able to.

[reegnz]

Cool, you're awesome!