pass in kubeconfig.yaml

[Aergonus]

An alternative for running ps on machines as a role account for example, allowing the configuration of a kubeconfig via the ps config. This further reduces host dependencies for automation.

A consideration here is that we would have to import and validate the kubeconfig schema. We could attempt to create the kubeconfig to verify such as in #337 or use another library that keeps schema validations up to date. This would avoid the need to bump versions as in #345