Add "orchard run" command
Add "orchard run" command

It starts a proxy to an Orchard host, then runs a local command
with the DOCKER_HOST envvar set.

Signed-off-by: Ben Firshman <73675debcd8a436be48ec22211dcf44fe0df0a64@firshman.co.uk>

orchardup/go-orchard,orchardup/go-orchard