OAuth for cloning local git repo

[klokan]

I have realised that OAuth can be used to create the clone (including write access) to a repo.
This means the @jekylledit user would not need to be used at all - and after installation of the JekyllEdit - the web could just ask the admin user for his GitHub OAuth permission to GitHub and clone the repo he specify for him.

This will make first deploy significantly easier.

Cloning is done this way:

git clone https://<token>:x-oauth-basic@github.com/owner/repo.git

(from https://github.com/blog/1270-easier-builds-and-deployments-using-git-over-https-and-oauth)

To request the OAuth token there is a simple Web Application Flow - https://developer.github.com/v3/oauth/#web-application-flow
@o1da is using it already in our clientportal project.

The application Client ID / Client Secret is registered under klokantech organisation.
It could be passed to Docker via a system variable - so non-klokantech deploys are easy.