Update and expand nightly builds page

Author: headius

nightly.markdown

@@ -4,16 +4,22 @@ title: JRuby Nightly Builds
 ---
 # JRuby Nightly Builds
 
-The most recent successful snapshot gets released on Github nightly.
+The most recent successful snapshot gets published to Sonatype's snapshots repository every night and after every successful CI run. Only the `master` branch is automatically published.
 
-[**Latest nightly builds**](https://github.com/ruby/jruby-dev-builder/releases/latest)
-
-# JRuby Snapshot Builds
-
-We also publish snapshots of our development branches after every successful CI run.
+## Specific artifacts
 
 [**JRuby dist**](https://central.sonatype.com/repository/maven-snapshots/org/jruby/jruby-dist/): The installable distribution of JRuby is in the `jruby-bin` files. Unpack it, run `bin/jruby` and you're all set.
 
 [**Complete jar**](https://central.sonatype.com/repository/maven-snapshots/org/jruby/jruby-complete/): The "complete" jar, containing all standad libraries and preinstalled gems, is in the `jruby-complete...jar` file.
 
 [**Other artifacts**](https://central.sonatype.com/repository/maven-snapshots/org/jruby/): The full complement of Maven artifacts are available as snapshots.
+
+## Other Artifacts
+
+We also publish other non-Maven artifacts on a regular basis.
+
+[**jruby-jars gem**](https://github.com/jruby/jruby/actions/workflows/nightly-snapshot-publish-21.yml): The `jruby-jars` gem is built and archived during our nightly builds. Select a build and look for the archived gem.
+
+[**Docker images**](https://hub.docker.com/_/jruby): Dev snapshots are published to Docker Hub on request or after major updates.
+
+[**Dev builds on GitHub**](https://github.com/ruby/jruby-dev-builder/releases): Dev snapshots are packaged for the `setup-ruby` GitHub Action and other installers on a nightly basis.