Most contributors to openjdk/jdk will want to take advantage of automated testing, and most reviewers will expect that as well. But there are no instructions for doing so. Here are my personal notes:

I visited https://github.com/Martin-Buchholz/jdk/actions and it said

  Workflows aren't being run on this forked repository

  Because this repository contained workflow files when it was
  forked, we have disabled them from running on this fork. Make sure
  you understand the configured workflows and their expected usage
  before enabling Actions on this repository.

They're now enabled. Do the skara docs need to clarify this?

The same happened with jdk16. If you want automated testing, then after
creating the personal fork, visit e.g.
https://github.com/Martin-Buchholz/jdk16/actions - you will see "Workflows
aren't being run on this forked repository". Then click on the big green button
to enable them.