Tests - Make tests mockable in actions

[vinicvaz]

When running pytest in GitHub Actions, the piece_dry_run is executed in an external Docker environment that has no direct relation to the pytest code. While this approach offers the advantage of isolated environments and dependency management, it also has limitations when it comes to utilizing pytest mocks.

To strike a balance between these two needs, we need to find the best solution that combines the benefits of isolated environments with the ability to use pytest mocks effectively.