Potential fix for https://github.com/GrandEngineering/engine/security/code-scanning/2

To address the issue, add a permissions block to the workflow configuration to explicitly restrict the GITHUB_TOKEN permissions. Since the workflow only checks out repository code and builds/tests Rust projects (with no steps needing to push commits, create issues, or write pull requests), the minimal permissions required are read access to repository contents. Implement this fix by editing .github/workflows/rust.yml and inserting permissions:\n contents: read at the root level, just under the workflow name. This way, the workflow and all jobs within will inherit the minimal necessary permissions.

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Summary by CodeRabbit

• Chores
  • Updated internal CI/CD workflow permissions for enhanced security practices.

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