KWRuby September Part 2: Brotli and Rails

After Ryan Hall's presents his pull request for adding Brotli support on September 18th, we will have a workshop to review the code in that PR:
https://github.com/rails/rails/pull/29753

Before you come out, please try to clone the Rails repository, If you cannot we will just pair up so everyone can look at a laptop with the code on it.

There are a variety of topics we can touch on:
* getting the Rails test suite running on our laptops
* how Rails middleware works
* what are the parts of a middleware PR to Rails