feature: Support SSH agent forwarding

[shioshiota]

I implemented a feature to support SSH agent forwarding like Docker Desktop for Mac.
https://docs.docker.com/desktop/mac/networking/#ssh-agent-forwarding

I tested this feature on a machine with Apple M1 Max processor.

shiota@lima-colima:~$ ssh-add -l
Could not open a connection to your authentication agent.
shiota@lima-colima:~$ SSH_AUTH_SOCK=/run/host-services/ssh-auth.sock ssh-add -l
256 SHA256:yz69smEOak6d+q+X8I3pMtNVa/yu6kegZlVT3zRZYt8 [email protected] (ED25519)

[abiosoft]

Thanks for this, much appreciated.

However, this contribution is more or less obsolete as Lima now has inbuilt support for socket and ssh agent forwarding.

Socket forwarding is already implemented in the imminent v0.3.0 release and the socket.sh file is no longer required.
As for ssh agent forwarding, I will look at putting the feature behind a boolean flag. You can kindly create a separate issue for it.

To have an idea what to expect soon you can check the v0.3.0 milestone.

Thanks once again.

[scr-oath]

Any chance it supports forwarding the X11 socket too?