Harden GitHub workflows

[samdark]

Summary

• Pin workflow actions to commit SHAs.
• Set read-only GITHUB_TOKEN permissions for read-only workflows.
• Disable persisted checkout credentials where possible.

Validation

• zizmor --no-progress --no-exit-codes app-api/.github/workflows

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[coderabbitai]

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⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 083466eb-0a04-4a21-966f-14d1173d8a8a

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• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-zizmor-workflows

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.91%. Comparing base (d1252cb) to head (b9142a3).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #281   +/-   ##
=========================================
  Coverage     84.91%   84.91%           
  Complexity       52       52           
=========================================
  Files            16       16           
  Lines           179      179           
=========================================
  Hits            152      152           
  Misses           27       27           

☔ View full report in Codecov by Harness.
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🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.