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Backport migration prefault #1093

	name: Cloud Hypervisor Build (Nix)
	on: [push, pull_request, merge_group]
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- name: Code checkout
	uses: actions/checkout@v6
	with:
	fetch-depth: 0
	- uses: cachix/install-nix-action@v31
	# We restore Nix evaluation and Nix tarball cache, speeding up the CI.
	# This does not cover any Nix artifacts from the Nix store.
	- name: Restore Nix cache
	uses: actions/cache@v5
	with:
	path: ~/.cache/nix
	key: nix-cache-${{ github.job }}
	# Nix binary cache
	- uses: DeterminateSystems/magic-nix-cache-action@main
	# Dedicated step to separate all the
	# "copying path '/nix/store/...' from 'https://cache.nixos.org'."
	# messages from the actual build output.
	- name: Prepare Nix Store
	run: nix develop --command bash -c "nix --version"
	- name: Check Nix format
	run: nix fmt -- --ci
	- name: Check Nix Flake
	run: nix flake check -L
	- name: Build Cloud Hypervisor
	run: \|
	nix build -L .#default
	nix build -L .#cloud-hypervisor