In accordance with [this advisory](https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/) it's recommended we moved to a different scheme of setting env vars and updating PATH.
binary-compatible-builds
A small (ish) action which is intended to be used and will configure builds of Rust projects to be "more binary compatible". On Windows and macOS this involves setting a few env vars, and on Linux this involves spinning up a CentOS 6 container which is running in the background.
All subsequent build commands need to be wrapped in $CENTOS to optionally run
on $CENTOS on Linux to ensure builds happen inside the container.