Partially as a workaround of JENKINS-20503 bug and because I would also like to filter the change log I would like to build up the build notes myself to send to Testflight using a script. The Testflight plugin does support expanding environment variables in the build notes, but going from a script that generates arbitrary multi-line text to an environment variable usable in other build steps in Jenkins is non-trivial.

It would be nice to just bypass the environment variable and just use a file to generate the build notes for TestFlight.