Refactor: k8s-agent deployment update

[nandor-magyar]

The original task is split into two, this is the second half.
The other part: #244

You are going to need a cluster to develop this feature & test it, that can be done locally: kind or minikube.

Folder of k8s manifests:
https://github.com/dyrector-io/dyrectorio/tree/develop/agent/manifest/kubernetes

TODO:

• Extend the deployment manifest with an init-container, using the same image, receiving the config map, but having an extra init argument
• Test

Using the cli, you can start the application fairly easy and can test if it is working.

Expected behavior:

• Setup a k8s node in dyrectorio
• apply your local version of the updated manifest using kubectl
• it should start, connect normally
• create a simple product
• creating a deployment targeting your node you can provide secrets

[minhoryang]

I'll dive in this.

[minhoryang]

I'll make a PR after #293 merged.

[minhoryang]

merged.