Add GitHub Actions workflow to run tests

[veaceslavdoina]

We already know how to Manual run inside Kubernetes via Job #7 and we also

1. Have a workaround via custom entrypoint to authenticate on Kubernetes via kubeconfig
2. Have a kubeconfig for GitHub Actions
3. Have a kubeconfig for App

Now, we need a workflow to run tests manually via Job creation and later will run them on other GitHub events as well.