Hang on `exec` when git hangs on `TF401019`

[timabell]

Not sure why, but a pull from Azure DevOps is hanging, and that is blocking my git pull all

gitopolis exec -- git pull --prune

🏢 somerepo> git pull --prune
remote: TF401019: The Git repository with name or identifier somerepo does not exist or you do not have permissions for the operation you are attempting.

[hangs indefinitely]

Not really gitopolis' fault, but not great either. Not sure why git doesn't just time out and fail.

This is more annoying because if it isn't transient then there's no easy way to get past this error and pull the rest of the repos.