I have found an issue with it.

When I run the sequence

rake clean
rake setup[local]
_scripts/publish-to-github.sh

the cache directory is not part of what is deployed. And that's expected.

But when this sequence is run on Jenkins, the cache directory is added https://github.com/hibernate/hibernate.github.io/commit/0154ad4fbcb6c2925699840caf42fadf898966bd
And that's not correct.

Also for some reason rake setup[local] reinstall the gems and download the cache content on each build. But maybe that one is expected.