Update Dockerfile

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced Docker build process for better flexibility and dependency management.

📊 Key Changes

• Changed the order of operations: now copies the repository contents into the Docker image before cloning the repo.
• The repository is now cloned into a new directory /usr/src/yolov5 instead of /usr/src/app as previously.

🎯 Purpose & Impact

• 🧩 The adjustment in file copying and cloning order allows for a more robust build process, potentially accommodating scenarios where local edits need to be included in the Docker image.
• 🔄 The separate cloning destination /usr/src/yolov5 could help in differentiating between the base repo and any additional local content provided, simplifying development and debugging processes.
• 🚀 These changes might offer developers an improved and more straightforward experience when testing and deploying their applications using the Ultralytics Docker image.