Setup docker

[njm222]

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[bjornstar]

Pardon my ignorance, but what is the point of using docker for this?

[njm222]

It's not super necessary now, but I'm just putting things in place for a multiplayer version.

So when someone creates a backend for it the app is already containerized for easy integration & deployment.

Also some people might prefer running it in a container when developing

[codeway-0841]

Also some people might prefer running it in a container when developing