How to make docker image from droplet

I have an Ubuntu 18.04 droplet with LEMP stack and my app. I would like to remove mysql and create a custom docker image having the OS, NGINX, PHP and my app.

Is there an easy way to do this without creating from scratch with docker commands?

(Removal of MySQL is so as to dockerize it separately.)

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You are very likely to find a container with this configuration at docker hub: At Docker Hub, use the search to find a pleasing configuration.

Good idea on separating MySQL. This way you can treat its special needs for data storage.