Fix usn-log.json path in build-release-metadata.sh

[neddp]

Looks like this was a result of the change here - 878080f

publish-ubuntu-jammy pipeline is currently failing: https://bosh.ci.cloudfoundry.org/teams/stemcell/pipelines/ubuntu-jammy-publisher/jobs/publish-ubuntu-jammy-1/builds/58

bosh-stemcells-ci/ci/tasks/build-release-metadata.sh: line 45: usn_log_json_file: unbound variable

[coderabbitai]

Walkthrough

The Ubuntu-specific USN log download logic in ci/tasks/build-release-metadata.sh was adjusted to fix how the output path is constructed for the meta4 command. The usn_log_json_file variable is now set directly to a concrete path, removing an erroneous nested interpolation segment. The meta4 file-urls and meta4 file-download commands were updated to use the filename usn-log.json as the --file argument instead of the full path variable, while maintaining the same download destination.

Suggested reviewers

• aramprice

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: fixing the usn-log.json path in the build-release-metadata.sh script.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description clearly identifies the issue being fixed: an unbound variable error in build-release-metadata.sh caused by a previous change, with a direct reference to the failing pipeline build.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix_usn-log-json_path

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[mike-jc]

LGTM