### What needs to get done Modify the Charmcraft build process to introduce a new flag (e.g., --pip-url) that allows users to specify a custom URL for retrieving pip instead of relying on the hardcoded PythonHosted.com link. This will enable users to utilize locally cached or managed package repositories, improving flexibility and reducing external dependencies. ### Why it needs to get done In some secure environments it is preferable to use locally cached packages for enhanced security. Without the ability to point the build process to locally cached versions of required dependencies, it is not possible to implement DevOps workflows for charm development.