The Docker Build and Push workflow spends more time pushing than building
because the entire ~115MB Eagle classpath ships as one pkg_tar layer, so
every Scala commit re-uploads the whole blob to DOCR.
Add a jar_split rule that partitions the scala_binary's transitive runtime
jars by workspace into a stable third-party layer (76MB, 137 jars) and a
first-party layer (38MB, 989 jars). crane skips the unchanged deps blob, so
typical Scala-only commits re-upload ~38MB instead of ~115MB. Entrypoint
switches from -jar fat.jar to a -cp classpath glob over both layer dirs.
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
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