How can I containerized my Lumen app using Docker

I recently came a across to Laravel/Lumen framework and also huge fan of Laravel php framework , recently I created an epos system backend by lumen php micro framework this is cool no problem with that , but now I would like to dockerize my lumen app using docker so it will easy to deploy lumen part to production server so what are the basic steps to do , that's my biggest question by the way my requirements are ,

Ubuntu 18.04 docker installed | docker composer installed lumen project only for backend inside /mnt/lumen

how can I dockerize my lumen app in my local pc ?