Phpmyadmin docker

@brady.miller, additional installation of phpmyadmin is a security hole if brought in with apt install. Your awesome work to bring dockers to this project will provide added layer of security if we provide recipe for deploying phpmyadmin as a container even for non-docker emr installations. Admins will be required to run the container when they need phpmyadmin and it would either be stopped or timeout as specified. Specially on ubuntu, snap install docker followed by docker pull phpmyadmin/phpmydmin, this is a two line install process.

Would appreciate if you can post the relevant extracts from standard docker config for best practice deployment of phpmyadmin.