Any future for SSH git access with passphrase?

I see in the docs this is not supported, but wonder if its an eminent feature or a if there is a work around. I'm specifically using the docker integration to run copybara, but my ssh key has a pretty long passphrase.

(FTR I'm stoked this exists, its what I always hoped MOE would be, but this unlike MOE just worked pretty much OOTB, so thanks!)