fix: resolve actionlint warnings and extend documentation

[hrzlgnm]

Summary

• Fixed actionlint warnings in GitHub Actions workflows and reusable actions
• Removed invalid type: boolean from action metadata
• Added container_image property to matrix definitions
• Fixed null expression in container template
• Extended AGENTS.md to include actionlint usage in development workflow
• Added actionlint command to linting section and CI/CD integration documentation

Changes

• .github/actions/setup-rust-cache/action.yml: Removed invalid type declaration
• .github/workflows/test-reusable.yml: Added missing matrix property and fixed expression
• AGENTS.md: Added actionlint commands and workflow steps

Summary by CodeRabbit

• Chores

  • Refined CI/CD workflow configuration and container setup handling.

• Documentation

  • Updated development guidelines to include GitHub Actions workflow validation requirements.

[hrzlgnm]

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📝 Walkthrough

Walkthrough

Three targeted configuration and documentation updates: removed explicit boolean type declaration from a GitHub Action input, added null container_image matrix entries with empty string fallback, and integrated actionlint validation guidance into developer documentation for workflow modifications.

Changes

Cohort / File(s)	Summary
GitHub Actions Configuration .github/actions/setup-rust-cache/action.yml, .github/workflows/test-reusable.yml	Removed boolean type declaration from save-cache input (defaults to string), and updated workflow matrix to include null container_image values with empty string fallback instead of null.
Documentation Updates AGENTS.md	Added actionlint as a recommended validation step for GitHub Actions workflows across Code Style Guidelines, Development Workflow, and CI/CD Integration sections.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• chore: Add AGENTS.md #106: Adds the AGENTS.md file that this PR updates with workflow validation guidance.

Poem

🔧 Type declarations gone, strings handle the load,
Container defaults smooth the workflow road,
Actionlint checks keep those actions in line,
A tidy CI pipeline, things running fine,
No one's getting fired today, not on my watch! 🚀

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: resolve actionlint warnings and extend documentation' accurately reflects the main changes: fixing actionlint issues in GitHub Actions workflows and extending AGENTS.md documentation.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/actionlint-warnings-and-docs

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