introduce lua script

[zreigz]

Summary

This PR replaces values.yaml.tpl with values.yaml.lua

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Test Plan

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 2b15703):

https://pluralsh-console--pr166-lua-template-6lwlqnsb.web.app

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