feat: Add actionlint workflow to validate GitHub Actions

[AnzalKhan16]

✅ Add actionlint for GitHub Actions Workflow Validation

Overview

GitHub Actions workflows should be validated prior to execution to catch syntax errors, invalid expressions, and common configuration mistakes. This PR introduces actionlint into the CI pipeline to statically analyze all workflow files and ensure correctness, improving overall pipeline reliability.

Changes Made

• Created a new workflow at .github/workflows/actionlint.yml.
• Configured the workflow to trigger on push and pull_request events affecting files in the .github/workflows/ directory.
• Integrated the popular reviewdog/action-actionlint action to run actionlint against all workflow files.
• The pipeline is explicitly configured to fail (fail_on_error: true) if any validation errors are detected, preventing broken workflows from being merged to master.
• reviewdog is configured to report linting errors directly in the GitHub PR check interface for immediate feedback.

Verification

• Checked that the actionlint.yml file has correct YAML syntax.
• Existing workflows continue to operate normally; this workflow simply serves as a fast static analysis gate specifically for .github/workflows/**/*.yml changes.

fixes #11945

[vercel]

@AnzalKhan16 is attempting to deploy a commit to the sandeepvashishtha's projects Team on Vercel.

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[codescene-access]

No application code in the PR — skipped Code Health checks.

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Quality Gate Profile: Custom Configuration
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