feat(ci): support tagged releases on luarocks

[barrettruth]

Closes #267

todo

1. @mochaaP For longer-term shared ownership, would you be open to creating an nvimtools luarocks account and transferring the package?
2. deploy tag v0.1.0

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/luarocks-tagged-releases

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[mochaaP]

I'm okay with tagging releases, but not very sure about semver. Can we do something like https://github.com/abseil/abseil-cpp or https://github.com/ppy/osu?