chore: Add permissions to workflow files for read access

[chengwenxi]

Summary by CodeRabbit

• Chores
  • Updated GitHub Actions workflow configurations with permission declarations.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request adds a permissions block granting read access to repository contents across three GitHub Actions workflow files (build, lint, and test). No changes were made to job logic, steps, or environment variables.

Changes

Cohort / File(s)	Summary
GitHub Actions Permissions \.github/workflows/build\.yml, \.github/workflows/lint\.yml, \.github/workflows/test\.yml	Added permissions.contents: read block to each workflow to explicitly grant read access to repository contents during workflow execution.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Three workflows now wear their badges with pride,
With read-only keys they open wide,
Repository contents in view,
Permissions done clean and true! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and specifically describes the main change: adding permissions blocks to workflow files to grant read access to repository contents.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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