Add docker build to Autorippr

[garthy]

This adds initial support for building a Docker image with Autorippr in it.

This has not been optimised for size and could do with some tidying up but this is the first pass.

You can use it by running " docker run -ti -v /tmp:/tmp --device=/dev/sr1 autorippr --all"

Todo.

Make config options overridable by env vars? Shrink image ...

[JasonMillward]

Only thought would be to perhaps remove the build_makemkv/Dockerfile directory and instead rename to Dockerfile-makemkv, then docker build -f Dockerfile-makemkv

And maybe add --force-rm to docker run --rm buildmakemkv | tar xz

[garthy]

The reason I have a separate directory is so Docker doesn't send all the context to this build. But can make that change easily. I still have to make it more configurable and maybe reuse the install script.

[JasonMillward]

Are you happy for me to merge this in now or is it still in development?