feat: Add support for Lua files

[ianlewis]

Adds support for adding headers to Lua files.

Fixes #88

[mbrukman]

Hey @ianlewis, great to see a PR from you (actually two I see) and so sorry I did not review this earlier! My bad.

Looks like in the meantime, macos-13 has been EOL'd and removed so that check is now failing. Let me replace that with macos-14 or maybe even macos-15 so we get to a green state, and then you can rebase and repush.

Give me a bit of time, will get this sorted out shortly.

[mbrukman]

OK, @ianlewis — please sync your main branch and rebase your lua-support branch and git push -f so we can rerun the tests. Thanks for your patience!

[ianlewis]

OK, @ianlewis — please sync your main branch and rebase your lua-support branch and git push -f so we can rerun the tests. Thanks for your patience!

I rebased it over main so it should be good now.

[mbrukman]

Thank you, @ianlewis!