Add Configure Brew Environment Variables as a Brew TIL

brew/configure-brew-environment-variables.md

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+# Configure Brew Environment Variables
+
+The `brew` CLI can be configured with a ton of different environment variables.
+A full listing of those can be found in the [Environment section of their
+docs](https://docs.brew.sh/Manpage#environment).
+
+If you want to change the defaults of any of those values, you can either set
+them directly in your environment:
+
+```bash
+$ set HOMEBREW_BAT=1
+```
+
+Or you can set them in a more dedicated place like one of Homebrew's
+environment files. There are a couple possible locations for these files. I
+prefer to use `$HOME/.homebrew/brew.env` (i.e. `~/.homebrew/brew.env`).
+
+```
+HOMEBREW_BAT=1
+```
+
+This file and directly likely don't exist, so you may have to set them up the
+first time:
+
+```
+$ mkdir $HOME/.homebrew
+$ touch $HOME/.homebrew/brew.env
+```