[K8s] Cannot sky show-gpus for service account

[cblmemo]

After following this script, The service account cannot use sky show-gpus:

https://github.com/skypilot-org/skypilot/blob/master/sky/utils/kubernetes/generate_kubeconfig.sh

$ sky show-gpus
kubernetes.client.exceptions.ApiException: (403)
Reason: Forbidden
HTTP response headers: HTTPHeaderDict({'Audit-Id': '6a01a9c6-d667-4816-8b90-ae99429e8284', 'Cache-Control': 'no-cache, private', 'Content-Type': 'application/json', 'X-Content-Type-Options': 'nosniff', 'X-Kubernetes-Pf-Flowschema-Uid': 'a37a4b2a-0f7c-41db-afd4-135a4e9c0c4f', 'X-Kubernetes-Pf-Prioritylevel-Uid': '176b72f8-e01f-45b3-851f-d27f78180235', 'Date': 'Wed, 23 Oct 2024 00:09:11 GMT', 'Content-Length': '273'})
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"pods is forbidden: User \"system:serviceaccount:default:sky-sa\" cannot list resource \"pods\" in API group \"\" at the cluster scope","reason":"Forbidden","details":{"kind":"pods"},"code":403}

Version & Commit info:

• sky -v: PLEASE_FILL_IN
• sky -c: skypilot, commit f5d4f64