I have a Gitlab CI pipeline that's building a Unity project which has packages being pulled from a git repository. There are a number of packages, but they're all in one of two groups, and I can get a PAT for both (I can't use SSH keys in this particular instance due to some other constraints). Unity uses the git credential manager to authenticate for packages (details), but I'm unsure how to actually add those credentials to the helper from the command line.
The runner is using the Shell executor on a Windows 10 machine, and I can inject the PATs using environment variables, but the part I don't know how to do is get them added to the credential manager, and in this case they will need to be scoped to the specific group URLs similar to this answer. The git installation on this machine is also configured to use the Windows Credential Manager.