add Dockerfile #3

	name: PR Checks

	on:
	pull_request:
	branches: [main]

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2
	- name: Build Docker image
	uses: docker/build-push-action@v4
	with:
	context: .
	push: false
	load: false
	tags: app:pr-${{ github.event.pull_request.number }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

	test:
	runs-on: ubuntu-latest

	services:
	redis:
	image: redis
	ports:
	- 6379:6379
	options: >-
	--health-cmd "redis-cli ping"
	--health-interval 10s
	--health-timeout 5s
	--health-retries 5

	steps:
	- uses: actions/checkout@v3
	- name: Use Node.js
	uses: actions/setup-node@v3
	with:
	node-version: '18'
	- name: Install dependencies
	run: npm ci
	- name: Run tests
	run: npm run test
	env:
	REDIS_HOST: localhost
	REDIS_PORT: 6379

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