Add a Docker Setup

[mhellmeier]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "x" next to an item)

• Documentation update
• Bug fix
• New feature
• Other, please explain:

What changes did you make? (Give an overview)

Add a docker setup for local testing and development to fix #396.

Is there anything you'd like reviewers to focus on?

No.

[andi34]

There was a docker file added for review in the past, but I am not familiar with docker to be true.
andreknieriem#180

[mhellmeier]

I also checked that Dockerfile. It builds everything from scratch by using the debian:buster-slim image. In my opinion, that's too complicated because other developers created scripts for that. Therefore, I used the webdevops/php-nginx image that comes with a pre-build nginx server and PHP installed to reduce the maintenance overhead.

If you aren't familiar with docker you can have a look at the commands used in the Dockerfile. I got them from the current installation script and the wiki.

I tested the whole setup and it works pretty well! I would be very happy to see it merged in the current dev branch.

If you want to test it on your machine:

1. Install docker
2. Install docker-compose
3. Open a terminal in the project directory and execute docker-compose up --build
4. That's it! Visit localhost:8080 in a browser and it should show the Photobooth application!