Build a Docker container to take a screenshot of URL using my existing python script.

I have a a python script which accept 1 argument of a url, the script then uses Pillow, Selenium, and phantomjs to take a screen shot of the URL I would like you to build a lightweight Docker image using Alpine linux, install all of the python dependencies using a [login to view URL] file When I start the container with --run I can pass the URL as an argument, the container builds or if already running executes the python script inside and gets a screenshot of URL.