Syncing an environment with a dependency from a private package index that lacks configured credentials causes hatch to hang. If you use the -v flag, you can see pip is prompting for a password.

Steps to reproduce

1. Add a private package index to user pip.conf
2. Add a dependency to a python project from the private index
3. Run hatch shell

Possible solutions

Adding the --no-input flag to pip installs, would prevent pip from prompting the user for credentials.