Add gnupg to Dockerfile-cpu

[glenn-jocher]

Signed-off-by: Glenn Jocher glenn.jocher@ultralytics.com

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update to YOLOv5's CPU Dockerfile to include gnupg package.

📊 Key Changes

• Addition of the gnupg package to the Dockerfile used for CPU-based installations.

🎯 Purpose & Impact

• Purpose: The gnupg package is used for encryption and signing data and communications. Its inclusion in the Dockerfile indicates a need for security features that can enforce authenticity or confidentiality in certain operations within the YOLOv5 environment.
• Impact: Users leveraging the Docker container for YOLOv5 on CPU systems will now have additional cryptographic capabilities, allowing for enhanced security measures when needed. This change might be in preparation for future features that require secure data transactions or verification of data integrity.