Docker build

[Jancis]

I need to extend your image and so i want to base my Dockerfile on yours. I get this error:

Sending build context to Docker daemon   2.56kB
Step 1/5 : FROM carlos-jenkins/python-github-webhooks
pull access denied for carlos-jenkins/python-github-webhooks, repository does not exist or may require 'docker login'

Can you please make a docker hub integration that will pull the master releases and build images? It's very easy, just follow these instructions: https://docs.docker.com/docker-hub/builds/