Hotfix CI/CD

[jflo]

As Besu becomes more modular, and refactoring becomes more aggressive, we may need finer grained resolution to our releases.

While still abiding by all normal release/review policies, we should also add the capability to create a release from an ephemeral hotfix branch, and create all essential artifacts from it. This must include artifact jars and docker images, but does not require documentation or homebrew.