Docker and Git versionning - which branch is used to build the docker? : As I would like to run a dockerfile to test a [parse-dashboard](https://github.com/ParsePlatform/parse-dashboard), I have fallen on their famous "Parse Dashboard can only be remotely accessed via HTTPS" message that you can normally bypass by adding the line :`"allowInsecureHTTP": true`in your parse-dashboard-config.json file. 

But even if I have add this option in my config file, the same message was display.
So I have decided to enter in the docker and then edit this config file.

Then I discover that it wasn't at all the file that I was expecting for.
In fact, my project is a branch of a github repository. 

Locally, I'm working on the development branch. 

So, if I open the config file with my IDE, I can see the right content. 

But what it is upload to my docker, it's in fact the config file of my master branch.

Is there any way to let docker know which version of your project to use for your deployment in the docker ? 

(as we can do on Heroku by example when you deploy a github sync project)