docker/docker — pull request #7239 by rhatdan (2014-07-25 15:12:04+00:00)
Title: Allow setting of environment variables when importing docker images

We want to be able to set the container=docker environment
variable when we build RHEL docker images. I believe there
will be other use cases where you might want to set
environment in base images.

Since you can do this in layered image, I see no reason not
to allow it in base images.

Docker-DCO-1.1-Signed-off-by: Dan Walsh (github: rhatdan)