Add derivation to build lightswitch with nix #53

	name: vmtests
	on:
	pull_request:
	push:

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	vmtests:
	runs-on: ubuntu-22.04
	permissions:
	id-token: write
	contents: read

	steps:
	- uses: actions/checkout@main
	- uses: DeterminateSystems/nix-installer-action@main
	- uses: DeterminateSystems/magic-nix-cache-action@main

	- name: Install system dependencies
	run: \|
	export DEBIAN_FRONTEND=noninteractive
	sudo apt-get -y install --no-install-recommends qemu-system-x86 qemu-guest-agent

	- name: Set up nix dev env
	run: nix develop --command echo 0

	- name: Build `lightswitch`
	run: nix develop --ignore-environment --command bash -c 'cargo build'

	- name: Run kernel tests
	run: nix develop --command 'vmtest'

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