CLI: opctl app status should tell user to use kubeconfig file if deploying via microk8s.

[Vafilor]

With a microk8s deployment, we need to use the config file obtained from microk8s config > kubeconfig

So the command is KUBECONFIG=./kubeconfig opctl app status

If you don't do this, you get an error like this

We need to update the command to if we are deploying to microk8s, and if that error happens offer the suggestion to do KUBECONFIG=./kubeconfig