Seems this action is obsolete: https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-the-automatic-deletion-of-branches
This adds a example commandline and also checks for the AMI_DISK_SIZE being only and integer.
Signed-off-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>