Dockerise Magento installation

[rickardd]

Details

Add docker container to simplify maintenance as well as allowing switching Magento version easily.

Set up different localhost URLs for the different versions.

Completion criterias

• We can easily run a docker container for different computers.
• We can test different Magento versions by changing the URL in the browser.

[rickardd]

@erikfercak How much time do you think we need?

[erikfercak]

I estimate it will take us up to 2 days to get it all up and running.