feat: Added sensitive files check to CI pipeline

[shivasankaran18]

Closes #311

Changes

• Implemented a GitHub Actions workflow to detect unauthorized modifications to sensitive files.
• Used tj-actions/changed-files@v45 to retrieve changed files in a pull request.
• Added a Bash script that checks if any restricted files (e.g., .github/, package.json, Dockerfile) were modified.
• The CI pipeline fails the PR if unauthorized changes are detected.

Flags

• Ensure that the list of sensitive files is up to date—do we need to add/remove any?

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

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