Create commands to run after automated Docker build (#30)

* Create commands to run after automated Docker build

Tags the Docker image with the commit number and pushes the image up to Docker Hub.

* Images are pushed after each build 

A build is triggered when someone makes a PR.

Author: celine168

rich-default/hooks/post_build

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -e
+
+# Adapted from the Jupyter Docker Stacks repository
+# Example: https://github.com/jupyter/docker-stacks/blob/master/datascience-notebook/hooks/post_push
+
+# Tag the latest build with the short git sha. Push the tag in addition
+# to the "latest" tag already pushed.
+GIT_SHA_TAG=${SOURCE_COMMIT:0:12}
+docker tag $IMAGE_NAME $DOCKER_REPO:$GIT_SHA_TAG
+docker push $DOCKER_REPO:$GIT_SHA_TAG