DS-970: Add Magic Nix Cache and other workflow changes #35

	name: CI

	on:
	pull_request:
	push:
	branches: [main]

	jobs:
	build:
	name: Build
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v3
	- name: Install Nix
	uses: DeterminateSystems/nix-installer-action@main
	- name: Enable magic Nix cache
	uses: DeterminateSystems/magic-nix-cache-action@main
	- name: Record existing bundle hash
	run: \|
	echo "BUNDLE_HASH=$(sha256sum <dist/index.js \| sed 's/ -//')" >>$GITHUB_ENV
	- name: Build action
	run: \|
	nix develop --command -- just build
	- name: Check bundle consistency
	run: \|
	NEW_BUNDLE_HASH=$(sha256sum <dist/index.js \| sed 's/ -//')
	if [[ "$BUNDLE_HASH" != "$NEW_BUNDLE_HASH" ]]; then
	>&2 echo "The committed dist/index.js is out-of-date!"
	>&2 echo
	>&2 echo " Committed: $BUNDLE_HASH"
	>&2 echo " Built: $NEW_BUNDLE_HASH"
	>&2 echo
	>&2 echo 'Run `just build` then commit the resulting dist/index.js'
	exit 1
	fi

	run-x86_64-linux:
	name: Run x86_64 Linux
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v3
	- name: Install Nix
	uses: DeterminateSystems/nix-installer-action@main
	with:
	extra-conf: \|
	narinfo-cache-negative-ttl = 0
	- name: Cache the store
	uses: ./
	- name: Check the cache for liveness
	run: \|
	.github/workflows/cache-test.sh

	# run-x86_64-darwin:
	# name: Run x86_64 Darwin
	# runs-on: macos-12
	# steps:
	# - uses: actions/checkout@v3
	# - name: Install Nix
	# uses: DeterminateSystems/nix-installer-action@main
	# with:
	# extra-conf: \|
	# narinfo-cache-negative-ttl = 0
	# - name: Cache the store
	# uses: ./
	# - name: Check the cache for liveness
	# run: \|
	# .github/workflows/cache-test.sh

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