[HELM] Fix missing yaml conversion for expander priorities

[bwhaley]

This should fix an error with Helm when passing expanderPriorities:

Error: template: cluster-autoscaler/templates/priority-expander-configmap.yaml:11:39: executing "cluster-autoscaler/templates/priority-expander-configmap.yaml" at <4>: wrong type for value; expected string; got map[string]interface {}

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[bwhaley]

Oh, I just noticed #3776. This fix seems worthwhile though, no? This interface is more intuitive.

[bwhaley]

I've signed the CLA.

[AndrewFarley]

BUMP, this bit me in the ass, please accept this PR

[gjtempleton]

/assign @gjtempleton

Hey, sorry for the delay in this being reviewed, I use being assigned as my working filter (hence the ci-robot's advice to assign PRs) so it slipped through the gaps. You're going to need to bump the chart version here to allow this to be published.

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• ❌ - Ben Whaley The commit (a2f9bdb) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[bwhaley]

Consider it bumped!

[bwhaley]

/check-cla

[bwhaley]

/cc gjtempleton

[gjtempleton]

Thanks for that!

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bwhaley, gjtempleton

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