CI: fix mis-applied parallel

[aramprice]

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 693f4560-4da3-4b56-808f-2f91f62527ab

📥 Commits

Reviewing files that changed from the base of the PR and between 3b15ab7 and 3aeb87e.

📒 Files selected for processing (1)

• ci/pipelines/publisher.yml

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Walkthrough

This pull request modifies the CI/CD pipeline configuration for the BOSH Linux stemcell builder. The change alters the execution model in the publisher job's plan block from parallel execution (in_parallel) to sequential execution (do). This single-line modification affects how the subsequent pipeline steps within that group are orchestrated during the publish process.

Suggested reviewers

• beyhan
• ramonskie
• benjaminguttmann-avtq

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-parallel

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