On macOS you cannot simply forward your authentication socket to a docker container to be able to e.g clone private repositories that you have access to. You don't want to copy your private key to all containers either.

The solution is to add your keys only once to a long-lived ssh-agent container which will forward the socket to other containers. Your keys stay secured in your local ssh-agent container which can be stopped any time when no longer needed.

View readme on github https://github.com/nardeas/ssh-agent⁠