Thoughts
EarthBuild is faster than GitHub Actions/similar CI but it's equally difficult to set up. And it's not as fast as a container-less solution.
Also it sucks to say but faster doesn't matter in CI. I have an Earthfile now. It's not worth my time to update GitHub actions to use it.
It would have been nice if they had tried to tackle some of the complexity around building, package installation, container setup, and self-hosting. Here's the thing: I don't use GitHub actions for most of my projects, because it's not worth it. It would have been nice if EarthBuild was simple to use as a build system (like `just`) and also gave me all of the advantages of reproducible, fast, CI builds.