Twitch CLI Dockerfile.

Got tarbombed by the twitch CLI installer? Install it in Docker instead.

Just build with Docker (after reading install.sh):

$ docker build --tag=twitch-cli .

And run the image with Docker, passing arguments directly on the end of the run command:

$ docker run --rm -it twitch-cli version

(You did read the install script before running it, right? Right?!)