Allow specifying the scheduler container entrypoint in the helm chart

[chotiwat]

What type of PR is this?

/kind feature

What this PR does / why we need it:

The current chart template doesn't support the older kube-scheduler image which doesn't specify ENTRYPOINT in the image. This PR allows customizing the container entrypoint through the new scheduler.command value.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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[Huang-Wei]

By "older kube-scheduler image", do you mean the v0.29.7 image? If so, we changed back the default entrypoint to /bin/scheduler (#794) - which is available in v0.29.8 and master.

And we will keep the path unchanged in the future, for backwards compatibility. Did it resolve your issue?

xref: https://kubernetes.slack.com/archives/C09TP78DV/p1723546975114219

[chotiwat]

@Huang-Wei By older images, I mean the ones before v0.29, e.g. https://github.com/kubernetes-sigs/scheduler-plugins/blob/v0.27.9/build/scheduler/Dockerfile#L28. I'd like to use the latest chart with an older image version to match my org's k8s clusters.

[Huang-Wei]

ok, I see the motiviation.

/ok-to-test

[Huang-Wei]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chotiwat, Huang-Wei

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