I've set all DDs and DMs as masters for the java-team, so anyone should be able to create new repositories.
As a replacement of the /srv/git.debian.org/git/pkg-java/setup-repository script we used on Alioth to configure new repositories I've created an equivalent script for Salsa: https://salsa.debian.org/java-team/pkg-java-scripts/blob/master/setup-salsa-repository Emmanuel Bourg