Bug 1088232 - mach ci-docker-run

I think he's meaning that we can only pass in a local gecko hg repo and not gaia for use with the b2g tasks (such as building building b2g).

Perhaps we could have --local-gecko-repo and --local-gaia-repo .  Unfortunately I think that within the builder, it uses hg for both m-c and the gaia integration repo whereas don't most people use the github gaia repo when developing?  I'm not sure.