Update README.md #871

	name: Docker

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	env:
	TEST_TAG: rails-on-docker:test

	jobs:
	build-and-test-image:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	push: false
	load: true
	tags: ${{ env.TEST_TAG }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

	- name: Inspect
	run: \|
	docker image inspect ${{ env.TEST_TAG }}

	- name: Start
	run: \|
	docker run -d --rm --name=rails-on-docker --env SECRET_KEY_BASE=dummy ${{ env.TEST_TAG }}

	- name: Logs
	run: \|
	docker ps
	docker logs rails-on-docker

	- name: Check Health
	run: \|
	for i in {1..30}; do
	status=$(docker inspect --format='{{.State.Health.Status}}' rails-on-docker)
	if [ "$status" = "healthy" ]; then
	echo "Container is healthy"
	exit 0
	elif [ "$status" = "unhealthy" ]; then
	echo "Container is unhealthy"
	exit 1
	fi
	sleep 1
	done
	echo "Timed out waiting for container to become healthy"
	exit 1

	- name: Logs
	run: \|
	docker logs rails-on-docker

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