Allow configuring the actual cluster DNS domain for the TLS certificate

[stephan2012]

Description

Currently, the cluster DNS domain cluster.local is hard-coded in the Helm chart for the webhook TLS certificate. This change provides a config option that allows using the actual cluster domain.

This is a non-breaking change, i.e., the cluster DNS domain still defaults to cluster.local.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @stephan2012. Thanks for your PR.

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[kishorj]

Thanks for your contribution.

Please add the new values to the configurations table in the README.md file

[kishorj]

/ok-to-test

[kishorj]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishorj, stephan2012

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