ci: add libprotobuf-dev to unit-tests-asan-coverage workflow

[renecannao]

Summary

CI-unit-tests-asan-coverage runs directly on the GitHub runner host
(not inside the deb/rhel/suse-compliant docker containers whose
entrypoints install libprotobuf-dev on demand), so the dependency
must be installed in the workflow itself.

Without it, any PR whose source builds with PROXYSQLGENAI=1 and
recurses into plugins/mysqlx fails at Makefile parse time:

Makefile:47: *** libprotobuf not found via pkg-config. Install
libprotobuf-dev (3.x). ... Stop.

This is what is currently blocking CI-unit-tests-asan-coverage on the
plugin-chassis PR (#5651): workflow_run reads the workflow YAML from
the default branch (v3.0), not from the PR branch, so the fix has
to live on v3.0 to take effect.

The change is purely the apt install list — no source code touched.
Adding libprotobuf-dev is a no-op on v3.0's own commits today (no
mysqlx plugin yet), but lines this workflow up with INSTALL.md and
unblocks the chassis PR's CI.

Test plan

• CI-unit-tests-asan-coverage on this PR is green (verifies the
  install step succeeds and the build path on v3.0 still works).
• Re-run CI-unit-tests-asan-coverage on plugin-chassis (PR Plugin chassis ABI + mysqlx plugin baseline #5651)
  after merge — should now find protobuf and reach the unit test
  step.

Summary by CodeRabbit

• Chores
  • Updated build infrastructure dependencies to support enhanced build verification processes.

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 596da389-cdd7-4f00-b185-6871eb20cba9

📥 Commits

Reviewing files that changed from the base of the PR and between 6ef036a and 455eed8.

📒 Files selected for processing (1)

• .github/workflows/CI-unit-tests-asan-coverage.yml

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📝 Walkthrough

Walkthrough

The CI workflow for ASAN coverage tests is updated to install libprotobuf-dev as a build dependency on the runner host. A comment is added explaining that this package is required for the mysqlx plugin when PROXYSQLGENAI=1 triggers protobuf-related checks during the dependency build process.

Changes

Cohort / File(s)	Summary
CI Workflow Dependency Update .github/workflows/CI-unit-tests-asan-coverage.yml	Added libprotobuf-dev to apt package installation in the "Install build dependencies" step with an explanatory comment regarding protobuf ABI-guard checks for the mysqlx plugin.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• #5618: Directly modifies the same CI workflow by adding libprotobuf-dev dependency and documentation comment for the PROXYSQLGENAI build configuration.

Poem

🐰 A protobuf in the workflow's nest,
libprotobuf-dev puts CI to the test,
With mysqlx plugin standing tall,
The ABI guards safeguard all! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch v3.0-ci-asan-libprotobuf-dev

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