How to set http_proxy, https_proxy with docker provisioner

[disaster37]

Use Case

I our company, we need to use coorporate proxy to access on internet.
So, litmus failed when it provision centos7 because of http_proxy and https_proxy is not set when It try to install openssh-server.

Describe the Solution You Would Like

How to set proxy parameters http_proxy and https_proxy before it install openssh-server, etc ...