docker context only uses root ssh-agent

[Miosame]

It seems like docker only uses the root ssh-agent, so if a keyring is exposing an ssh-agent at /run/user/1000/keyring/ssh it will be ignored by docker context ssh connections.

Is there a way currently to pass a path to which ssh-agent to query via environment variable? or to pass options to the ssh command context generates?

[thaJeztah]

/cc @AkihiroSuda