with:
        ruby-version: 3.0.0

Should be using a matrix, even if you only want a single version, as it makes it easier to add versions.
Morevover, I feel that just the current stable ruby version is not the best default. My recommendation would be current and two preceding, but I leave that up to the maintainers.
More importantly, I believe that ruby-head should be there b

I would love it if someone created a static website that explains about Project Lightspeed and also provides links to the repositories etc. I have a bunch of other things I need to work on right now so I wont be able to get to this for a little bit