publish geoip JARs to Maven Central

For Tor Browser, Orbot, TorServices, and other Android apps that use geoip, it would be super useful to have the geoip files published to Maven Central. Its the standard place for Android and Java libraries, and accepts arbitrary packages as well. It also fully supports reproducible builds with a .buildinfo file. This new generation method should also publish there. Sine this is built using a gitlab-ci job, it could also automatically publish to the local Package Registry https://gitlab.torproject.org/tpo/network-health/metrics/geoip-data/-/packages

Here's an example of how it should be deployed: https://repo1.maven.org/maven2/info/guardianproject/geoip/20191217/

This is my code so far, I'm happy to help integrate it: geoip-maven.zip