[Bugfix] to shared storage not working with dynamic PV provisioning

[NiccoloTosato]

This will fix #932

Summary

If shared storage is enabled, change HF_HOME from /data to /data/shared-pvc-storage

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Checklist

• Make sure the code changes pass the pre-commit checks.
• Sign-off your commit by using -s when doing git commit
• Try to classify PRs for easy understanding of the type of changes, such as [Bugfix], [Feat], and [CI].

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[gemini-code-assist]

Code Review

This pull request introduces support for shared PVC storage by updating the HF_HOME environment variable across vLLM deployments and Ray clusters. However, several critical issues were identified in the Helm templates. The logic in shared-storage.yaml incorrectly restricts PersistentVolume creation and storageClassName assignment when a storage class is defined, which breaks static provisioning. Additionally, while HF_HOME was updated in ray-cluster.yaml, the corresponding volume mounts for the shared storage are missing in both the head and worker groups, which will lead to runtime failures.

[ruizhang0101]

@NiccoloTosato Hi, could you sign the commit?

[NiccoloTosato]

@NiccoloTosato Hi, could you sign the commit?

Hi, signature added, checklist updated.

[ruizhang0101]

Hi I think there are still some past commits haven't signed, they need to be all signed for the CI to pass. The CI task is called DCO

[ruizhang0101]

LGTM