Pass $HUB and $TAG to the docker container (#106)
Pass $HUB and $TAG to the docker container (#106)

Docker does not pass unsolicited environment variables to the
running container. This makes perfect sense, but requires overrides
of any build specific environment variables.

A better approach is being worked on (I believe) here:

https://github.com/istio/common-files/pull/94
istio/common-files,istio/common-files