From Mahara Wiki
./release-X.Y.Z-cleanup.sh to upload the release and clean up any temporary files.
Note I: If running this file stops before completion for any reason you will need to edit it and comment out the bits that did finish so that you don't run those buts twice then try the script again. For example the script does the bit where it pushes the tag to the git remote and signs the zipped files but doesn't upload them - you would need to comment out the 'git push' lines and the 'gpg --armor' lines.
Note II: If the zipped files fail to upload to Launchpad via the script then you will need to manually upload the zipped files and their corresponding .asc files. To do this go to the milestone page in Launchpad and click the 'Add download file' link. Set the description to: release tarball and choose the matching zipped and .asc file to upload. You will need to do this for all the three types:
.zip, .tar.bz2, .tar.gz