Fix helm chart ci

[stevehipwell]

This fixes the failing Release Chart GH action, it's likely that the chart linting might fail with this but it shouldn't matter.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: stevehipwell
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[stevehipwell]

@serathius @s-urbaniak this should allow the Helm chart to be released once merged.

[stevehipwell]

@serathius @s-urbaniak I'd suggest cancelling the CI for this as only CI config has been changed (plus a markdown comment) and one of the CI jobs is expected to fail and be ignored.

[Filirom1]

Hello,

It seems to be failing because of protected branch gh-pages:

Pushing to branch "gh-pages"
remote: error: GH006: Protected branch update failed for refs/heads/gh-pages.        
remote: error: 5 of 5 required status checks are expected.        
To https://github.com/kubernetes-sigs/metrics-server
 ! [remote rejected] HEAD -> gh-pages (protected branch hook declined)
error: failed to push some refs to 'https://github.com/kubernetes-sigs/metrics-server'
Error: exit status 1

[stevehipwell]

@Filirom1 that's correct, for this release we have #822 to manually publish the index and gh-pages has now been un-protected for future releases.

[Filirom1]

Thanks, now it seems that there is no URL to download the chart in the index.yaml

[stevehipwell]

Thanks @Filirom1 I managed to mess this up in my PR. @serathius PR incoming.

[stevehipwell]

@Filirom1 could you try again now?