I need to create a new platofrm for Drupal 9 in Aegir.
I have created a makefile in /var/aegir/platform/makefiles/d9.make.
api = 2 core = 9.x projects = "drupal"
I get the No release history available for drupal 9.x. error. It seems there is a release from https://updates.drupal.org/release-history/drupal/8.x but not from https://updates.drupal.org/release-history/drupal/9.x.