Add Lua to the build matrix

[mark-cooke]

Hi @jessp01,

Thanks for opening the pull request for adding ci to devilspie2 - I hope it gets accepted.

I think it would be very useful, since it's API has changed a few times, to include Lua in the build matrix - so here's the necessary changes + a one-liner to verify the version.

I'd appreciate it if you'd include them into your original PR as I don't think dependent PRs across repos is very well supported on Github - and the maintainer already has 9 between us to deal with already, without interdependent ones too :)

Thanks,
Mark Cooke.

[jessp01]

Hi @mark-cooke ,

I think it would be very useful, since it's API has changed a few times, to include Lua in the build matrix - so here's the necessary changes + a one-liner to verify the version.

I agree. Merged.

The CI already proved itself useful as I found that the build fails with Clang >= 17. I submitted this pull to fix that: dsalt#42

Once merged, I'll reintroduce Clang testing to CI.