Upgrade Node.js to 20 #146

	name: checkin

	on:
	- push
	- pull_request

	jobs:
	checkin:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	node-version: [16.x]

	steps:
	- uses: actions/checkout@v1
	- name: Use Node.js ${{ matrix.node-version }}
	uses: actions/setup-node@v3
	with:
	node-version: ${{ matrix.node-version }}
	cache: 'yarn'
	- name: install
	run: yarn install --frozen-lockfile
	- name: build
	run: yarn build
	- name: test
	run: yarn test
	- name: release
	run: yarn release
	- name: 'check for uncommitted changes'
	# Ensure no changes
	run: \|
	git add .
	if ! git diff --cached --color=always --exit-code -- . ':!node_modules'; then
	echo "::error::Found changed files after build. Please run 'yarn release' and check in all changes."
	exit 1
	fi

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