Ability to run Sourcegraph Docker Image inside network with proxy

Created by: machbio

Feature request description

Ability to run SourceGraph Docker Image inside Corporate Network - that does not allow any traffic without Proxy

Is your feature request related to a problem? If so, please describe.

The SourceGraph docker instance does not allow cloning external git repositories in a corporate environment resulting in DNS Error of "Remote Repository not found" or "Hostname not found"

Describe alternatives you've considered.

None

Additional context

Tried using HTTP_PROXY and HTTPS_PROXY as environment variables when starting the sourcegraph docker instance - the application does not take the PROXY variables and there is no configuration setting to change this behavior in the sourcegraph ui settings page.