Rather than get the `Z80` class, define it. #7

	name: Build and test extension

	on:
	push:
	paths:
	- '.github/workflows/build-and-test-extension.yml'
	- 'ext/**'
	- 'lib/**'
	- 'z80.gemspec'
	pull_request:
	paths:
	- '.github/workflows/build-and-test-extension.yml'
	- 'ext/**'
	- 'lib/**'
	- 'z80.gemspec'

	jobs:
	build-and-test-extension:
	runs-on: ${{matrix.os}}

	strategy:
	matrix:
	os: [macos-latest, ubuntu-latest]
	ruby-version: ['3.2', '3.1', '3.0', '2.7']

	steps:
	- uses: actions/checkout@v3

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{matrix.ruby-version}}

	- name: Install dependencies (macOS)
	if: startsWith(matrix.os, 'macos')
	run: brew install redcode/zxe/z80

	- name: Install dependencies (Ubuntu)
	if: startsWith(matrix.os, 'ubuntu')
	run: \|
	sudo mkdir -pm700 /root/.gnupg
	sudo mkdir -pm755 /etc/apt/keyrings
	sudo gpg --no-default-keyring --keyring /etc/apt/keyrings/zxe-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys FE214A38D6A0C01D9AF514EE841EA3BD3A7E1487
	echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/zxe-archive-keyring.gpg] https://zxe.io/repos/apt stable main" \| sudo tee /etc/apt/sources.list.d/zxe.list
	sudo apt-get update
	sudo apt-get -y install libz80-dev

	- name: Build gem
	run: gem build z80.gemspec

	- name: Install gem (macOS)
	if: startsWith(matrix.os, 'macos')
	run: gem install z80*.gem -- --with-Z80-dir=$(brew --prefix)

	- name: Install gem (Ubuntu)
	if: startsWith(matrix.os, 'ubuntu')
	run: gem install z80*.gem

Provide feedback