The public repositories are published to Maven Central under the groupId au.gov.amsa
To be able to deploy release, you need to follow the Maven procedure an register yourself to be able to do so (when asking just cc someone who already have the karma to do so).
Then you need to have a settings.xml with the following entry:
<server>
<id>ossrh-staging</id>
<username></username>
<password></password>
</server>
<server>
<id>ossrh</id>
<username></username>
<password></password>
</server>
<server>
<id>ossrh-snapshots</id>
<username></username>
<password></password>
</server>
You need to upload your gpg key to a public gpg key server (see details here
A release is as simple as (quick one skipping test): mvn release:prepare release:perform -DskipTests -Dmaven.release.plugin.arguments="-DskipTests -Dspotbugs.skip=true" -DlocalCheckout=true -B
Then you log in to https://oss.sonatype.org/ and look at the staging repositories to close and release it.