add the gh actions setup file #7

	name: facebook/metro/build-and-test
	on:
	push:

	defaults:
	run:
	shell: bash

	jobs:
	run-js-checks:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@main
	- uses: ./.github/actions/yarn-install
	- run: yarn typecheck
	- run: yarn typecheck-ts
	- run: yarn lint
	- run: yarn test-smoke

	test-with-coverage:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@main
	- uses: ./.github/actions/yarn-install
	- run: yarn test-coverage
	- name: Download Codecov Uploader
	run: "./.circleci/scripts/install_codecov.sh"
	- name: Upload coverage results
	run: "./codecov -t ${{ secrets.CODECOV_TOKEN }} -f ./coverage/coverage-final.json"

	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	use-min-supported-version: [true, false]
	steps:
	- uses: actions/checkout@main
	- uses: ./.github/actions/yarn-install
	with:
	use-min-supported-version: ${{ matrix.use-min-supported-version }}
	- name: Run Jest tests
	run: yarn jest --ci --maxWorkers 4 --reporters=default --reporters=jest-junit

	test-windows:
	if: startsWith(github.ref, 'refs/heads/windows/')
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@main
	- uses: ./.github/actions/yarn-install
	- name: Run Jest tests
	run: yarn jest --ci --maxWorkers 4 --reporters=default --reporters=jest-junit
	# todo: how max workers are best?

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