Add Cockpit + PHP7.2 + Nginx docker image

[gabskoro]

I created a docker image that:

• Used PHP 7.2 + required modules (sqlite3, gd, mbstring, curl)
• Uses Nginx
• Downloads the application zip file from this repository

If you think this is nice to have, feel free to merge it or let me know if we should maybe move the text somewhere else rather then on the Readme page

[gabskoro]

C'mon guys, really... I didn't even one minute think about it as self-promotion. That's why I also wrote that we can move it somewhere else. Also if you guys have another idea I'm fine with it.

How would I contribute to the Dockerfile, maybe by adding a new one calling Dockerfile.nginx?

[aheinze]

@gabskoro thanks for the contribution! is there a reason why you're using php 7.2 and not eg 7.4?

[gabskoro]

@aheinze because there is no 7.3/7.4 version available through the debian repo, probably there is a way to add it, but I didn't spend any time looking for it. I also now see that they officially support for version 7.2 is till 30 November 2020, so probably would make sense to investigate it