[ump45nose]

What's Changed

The apache-release profile builds arrow-java-root-<version>-source-release.zip with the Apache parent's source-release assembly descriptor, which packs the whole working directory. In the release CI (ci/scripts/jni_full_build.sh . jni binaries) the pre-built JNI libraries are unpacked into jni/ in the source tree before Maven runs, so they end up in that zip (~870 MB uncompressed for 18.3.0; the 19.0.0 zip is still ~455 MB).

This adds dev/release/source-release.xml, a copy of the source-release descriptor from apache-source-release-assembly-descriptor 1.8 (the version used by the Apache parent POM) with one extra exclude for the top-level jni/ directory, and points the root POM's source-release-assembly execution at it. Nothing else about the zip changes; jni/ directories under src/ (Java packages) are not affected. I left testing/ in, since it is needed to run the tests from the source release.

Testing: I created a fake jni/arrow_dataset_jni/x86_64/libarrow_dataset_jni.so (5 MB) in the checkout and ran mvn -pl .,bom -Papache-release package -Dgpg.skip=true -DskipTests ...:

• on main: the zip is 8.5 MB, 2077 entries, and contains jni/arrow_dataset_jni/x86_64/libarrow_dataset_jni.so
• with this change: the zip is 3.5 MB, 2073 entries; the only difference is the jni/ entries
  mvn -pl .,bom -Pspotless spotless:check passes.

AI assistance disclosure: this change and description were prepared with the help of an AI coding assistant; the checks above were run locally.

Closes #743.

[github-actions]

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• bug-fix
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[ump45nose]

The "Ensure PR format" check is only waiting for a label. Could a maintainer add bug-fix? I do not have permission to label PRs here. (AI-assisted reply.)