Offer pre-built docker container with torus installed

[ianlivingstone]

It'd be nice for some use cases if Torus offered a pre-built docker container similar to the aws-cli docker container for use inside CI environments.

[ianlivingstone]

Ideally we use a very thin base image so the container is only torus and it's requirements (ca-certs).

[radmen]

@ianlivingstone actually I don't think that this is usable. Usually, such images require more software installed to perform certain operations.

I'd suggest providing an installation script for Docker images. Like this, for Alpine: https://github.com/radmen/docker-build-scripts/blob/master/scripts/alpine/torus-cli