Cross Version Testing Locally and Faster CI

[adamgordonbell]

This is a 🙋 feature or enhancement to the build process. Jekyll itself is unchanged.

• I've adjusted the contributor documentation to explain how to use the local cross-version feature

Summary

Introduce earthly to speed up JRuby tests and allow for running the CI locally across various ruby versions. This build should be about 10 minutes faster than the previous build (40+ minutes -> 27ish minutes).

I discussed this change with @DirtyF via email.

The JRuby build in GitHub Actions is the bottleneck for the CI process. By introducing an earthfile, the step can be optimized a bit, and also it allows for running the CI locally, across various ruby versions, by using containers.

Details

You can now run the full CI locally by running:

earthly +all

GitHub Actions also does a similar process, although it calls individual steps, which can also be run locally like follows:

    earthly --build-arg RUBY=2.5 +test

I believe the build can be made a bit faster than this, by running the jruby cucumber tests in parallel. This will add a little complexity to the build script and probably take another 10 minutes off. Let me know if interested and I can try it out and create a follow on PR.

Additionally, one cucumber test was failing in master, I believe I have fixed it.

[mattr-]

This looks fantastic. I left a whitespace nit that I would appreciate a fix for but won't let that block the PR

[adamgordonbell]

This looks fantastic. I left a whitespace nit that I would appreciate a fix for but won't let that block the PR

You are too kind. Thanks for the review! I adjusted the whitespace.

[adamgordonbell]

I believe this is ready to merge by someone with permission to do so.

[mattr-]

@jekyllbot: merge +dev