I’m not quite sure what exactly you’re referring to:
– Jenkins itself is hosted on github: https://github.com/jenkinsci/jenkins/
– The scripts I’m using are hosted in git on my own server: https://galileo.mailstation.de/cgit/cgit.cgi/jenkins-build.git/
The scripts won’t be moved to github but are accessible via anonymous cloning.
Let me know if I misunderstood your comment.