Add a script to simplify testing changes to the project

Currently, each image has to be built and tested manually.
This change allows for a single script to be executed that will build
all of the images and run the samples as a form of test for the images.

run_tests.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+set -e
+
+# This script builds all the Docker images and runs the samples
+
+# Rebuild the base image
+docker build --pull -t markadams/chromium-xvfb -f  images/base/Dockerfile images/base/
+
+# Build Python 2 image
+docker build -f images/python2-onbuild/Dockerfile -t markadams/chromium-xvfb-py2:latest-onbuild images/python2-onbuild
+docker build -f samples/python2/Dockerfile -t markadams/chromium-xvfb-py2-sample samples/python2
+
+# Build Python 3 image
+docker build -f images/python3-onbuild/Dockerfile -t markadams/chromium-xvfb-py3:latest-onbuild images/python3-onbuild
+docker build -f samples/python3/Dockerfile -t markadams/chromium-xvfb-py3-sample samples/python3
+
+# Build JS images
+docker build -f images/js/Dockerfile-6.x -t markadams/chromium-xvfb-js:6 images/js
+docker build -f images/js-onbuild/Dockerfile-6.x -t markadams/chromium-xvfb-js:6-onbuild images/js-onbuild
+
+docker build -f images/js/Dockerfile-7.x -t markadams/chromium-xvfb-js:7 images/js
+docker build -f images/js-onbuild/Dockerfile-7.x -t markadams/chromium-xvfb-js:7-onbuild images/js-onbuild
+
+docker build -f samples/js/Dockerfile -t markadams/chromium-xvfb-js-sample samples/js
+
+# Run samples to test
+docker run --rm markadams/chromium-xvfb-py2-sample
+docker run --rm markadams/chromium-xvfb-py3-sample
+docker run --rm markadams/chromium-xvfb-js-sample