Add GitHub Actions CI for Mac #15

	name: CMake build
	on:
	push:
	paths:
	- '.github/*/.yml'
	- 'CMakeLists.txt'
	- 'cmake/**'
	- '**.cc'
	- '**.h'
	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.ref }}
	cancel-in-progress: true
	jobs:
	cmake-linux-x86_64:
	runs-on: ubuntu-20.04
	timeout-minutes: 15
	steps:
	- uses: actions/checkout@v4
	- name: Update apt
	run: sudo apt update
	- name: Install ninja
	run: sudo apt install ninja-build
	- name: Configure
	run: cmake -Bbuild -S. -G Ninja -DCMAKE_BUILD_TYPE=Release -DFP16_BUILD_COMPARATIVE_BENCHMARKS=ON
	- name: Build
	run: cmake --build build
	- name: Test
	run: ctest --test-dir build
	cmake-macos-x86_64:
	runs-on: macos-12
	timeout-minutes: 15
	steps:
	- uses: actions/checkout@v4
	- name: Configure
	run: cmake -Bbuild -S. -G Xcode -DCMAKE_CONFIGURATION_TYPES=Release -DHAVE_STD_REGEX=TRUE -DFP16_BUILD_COMPARATIVE_BENCHMARKS=ON -DCMAKE_OSX_ARCHITECTURES=x86_64
	- name: Build
	run: cmake --build build --config Release --parallel $(sysctl -n hw.ncpu) -- -quiet
	- name: Test
	run: ctest --test-dir build
	cmake-macos-arm64:
	runs-on: macos-14
	timeout-minutes: 15
	steps:
	- uses: actions/checkout@v4
	- name: Configure
	run: cmake -Bbuild -S. -G Xcode -DCMAKE_CONFIGURATION_TYPES=Release -DHAVE_STD_REGEX=TRUE -DFP16_BUILD_COMPARATIVE_BENCHMARKS=ON -DCMAKE_OSX_ARCHITECTURES=arm64e
	- name: Build
	run: cmake --build build --config Release --parallel $(sysctl -n hw.ncpu) -- -quiet
	- name: Test
	run: ctest --test-dir build

Provide feedback