Install git-credential-oidc from source
go get github.com/KernelPay/git-credential-oidc
Configure git to use git-credential-oidc for your domain.
git config --global credential.https://git.example.com.helper oidc
Then login.
git credential-oidc login --issuer-url=https://accounts.google.com --client-id=XXX --client-secret=ZZZ
That's it! You can now use all git commands normally, and you'll be using OIDC authentication.
git clone https://git.example.com/MrDeveloper/SomeProject