Build a cmake Docker file with cmake for Synology

Hi guys!

I am new in Docker and want to build a Docker fule of this project to run it on my Synology DS918+

https://git.uli-eckhardt.de/?p=WcmToMqtt.git;a=summary

What I am bit confused about building the file with cmake.

Can you give my some help for the first steps?

Thanks!

Duffy6