fix: deploy the dashboard agent one environment at a time

[ericallam]

The dashboard agent deploy runs a matrix leg per environment (staging, prod). Running them in parallel deployed the same Trigger.dev project twice at once, and one leg failed to create the background worker while the other succeeded. max-parallel: 1 runs the legs sequentially so a deploy never races itself.

Also aligns the workflow's Node version to the repo standard (22.23.1, per .nvmrc).

Verified: re-running the staging leg on its own (no parallel prod) deployed cleanly.

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Latest commit: 7891790

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[coderabbitai]

Walkthrough

The dashboard agent deploy workflow now sets max-parallel: 1 on the deploy matrix strategy and updates the Node.js setup step from 20.20.2 to 22.23.1. No other workflow steps or parameters changed.

Changes

File	Summary
.github/workflows/dashboard-agent-deploy.yml	Added matrix serialization for deploys and updated the Node.js version used by actions/setup-node.

Related Issues: No related issues linked.

Related PRs: No related PRs found.

Suggested Labels: ci, github-actions

Suggested Reviewers: No specific reviewer suggestions available.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description doesn't follow the required template and is missing the issue link, checklist, Testing, Changelog, and Screenshots sections.	Fill in the template: add Closes #, complete the checklist, and provide Testing, Changelog, and Screenshots sections.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title is concise and accurately reflects the main change: sequential environment deployments for the dashboard agent.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/tri-11573-dashboard-agent-deploy-serialize

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