add support for nested virtualization #331

	name: Build
	on:
	push:
	paths-ignore:
	- example/**
	- README.md
	branches:
	- "main"
	pull_request:
	paths-ignore:
	- example/**
	- README.md
	jobs:
	formatting-check:
	name: Formatting Check
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Run clang-format style check for Objective-C files.
	uses: jidicula/clang-format-action@v4.8.0
	with:
	clang-format-version: '13'
	build:
	needs: formatting-check
	runs-on: ${{ matrix.os }}
	timeout-minutes: 6
	strategy:
	fail-fast: false
	matrix:
	os:
	- macOS-11
	- macOS-12
	- macOS-13
	go:
	- '^1.20'
	- '^1.21'
	steps:
	- name: Check out repository code
	uses: actions/checkout@v3
	- name: Set up Go
	uses: actions/setup-go@v4
	with:
	go-version: ${{ matrix.go }}
	- name: vet
	run: go vet ./...
	- name: Download Linux kernel
	run: make download_kernel
	- name: Unit Test
	run: make test
	timeout-minutes: 3
	- name: Build Linux
	run: make -C example/linux
	- name: Build GUI Linux
	run: make -C example/gui-linux

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