Configure publishing to GitHub Package Registry

[ccjernigan]

Is your feature request related to a problem? Please describe.

Sonatype has been hosed recently which makes publishing packages more difficult.

Describe the solution you'd like

Support publishing to GitHub Package Registry as a backup option. This should be straightforward, since our CI jobs can get a write token easily. Package registry does not have the same signing requirements as Maven Central, which simplifies the deployment.

Consumers of GitHub Package Registry will need to configure authentication, which creates some barriers for the consumer side.