add in_cluster option for KubernetesScheduler

[MBHuman]

Add in_cluster opts to run KubernetesScheduler on pods without ~/.kube/config file where $KUBECONFIG env is "" .

I have problem with my Airflow DAG, after that I implemented my solution to run KubernetesScheduler with volcano without KUBECONFIG

[2024-05-28, 20:13:35 UTC] {warnings.py:110} WARNING - /home/airflow/.local/lib/python3.12/site-packages/torchx/schedulers/kubernetes_scheduler.py:557: UserWarning: failed to load kube config: Invalid kube-config file. No configuration found.

Test plan:

Run on my airflow configuration with cfg

    app_handle = runner.run(component_spec, scheduler="kubernetes", cfg={
        "queue": "queue",
        "in_cluster": True
    })

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[d4l3k]

Is there a way to automatically detect this? Maybe we should try the kube_config and then this if KubeConfig doesn't exist via a try-except?

[MBHuman]

Ok, will try to add it