Adds an action for setting up brew and installing from brewfile

[mike-carey]

Problem

We would like an action that sets up brew now that Github-hosted runners no longer set it up by default.

Solution

Adds an action that sets up brew and installs dependencies from a brewfile.

Notes

• Requires Sets up brew before install dependencies #9
• Accommodates both linux and macos

Usage

jobs:
  # ...
  steps:
    - name: 'Checkout'
      uses: actions/checkout@v3

    - name: 'Install dev dependencies'
      uses: shopsmart/github-actions/actions/setup-homebrew@v2