Implement initial support for Kubernetes as machine provider

[Yshayy]

This feature will allow users to use their existing k8s infrastructure as backbone for Preevy environments.
Initial implementation can create a pod with support for nested Docker (probably need to be privileged or require additional CRI runtime), port-forwarding can be done with kubectl.
Persistent volume might also be interesting to add in the future to support "suspending" an environment.

Tasks

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1. driver abstraction changes #107
   +0
2. upload files using tar #106
   +0