Fix env variable to override the settings. Bug Fix for Docker

[farajfarook]

This is a bug in docker. if the config file exists in the docker build, the environment variables cannot override those settings.

[farajfarook]

Could this be a problem with the connections config too ?
I deployed adminmongo to a kubernetes cluster and no connection is added when i set the ENV variables.

@erSitz I'm not sure. May be you can use this image to see if it solves your issue.
https://hub.docker.com/r/farajfarook/adminmongo

This is a temporarily image i created to help myself until this PR get merged.

[stevenlafl]

I can get the config.json file populated just fine upon looking at the container. However, viewing the page shows no saved connection details.