Reproducible Builds - Part 2

[iBotPeaches]

• [x] Migrate to modern Gradle actions
• [ ] Support generating official releases from GH (including Maven publish)
• [ ] Support generation of Artifact Attestations
• [ ] Update internal doc

This should remove any effort I make locally to produce a release and be verifiable by community.

[iBotPeaches]

https://gist.github.com/sualeh/ae78dc16123899d7942bc38baba5203c