Add single database configuration instructions #128

	name: tests

	on:
	push:
	branches:
	- main
	pull_request:

	jobs:
	build:
	name: Tests
	runs-on: ubuntu-latest
	timeout-minutes: 10
	strategy:
	fail-fast: false
	matrix:
	database: [mysql, postgres, sqlite]
	services:
	mysql:
	image: mysql:8.0.31
	env:
	MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
	ports:
	- 33060:3306
	options: --health-cmd "mysql -h localhost -e \"select now()\"" --health-interval 1s --health-timeout 5s --health-retries 30
	postgres:
	image: postgres:15.1
	env:
	POSTGRES_HOST_AUTH_METHOD: "trust"
	ports:
	- 55432:5432
	env:
	TARGET_DB: ${{ matrix.database }}
	steps:
	- uses: actions/checkout@v4
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	- name: Install dependencies
	run: bundle install
	- name: Setup db
	run: \|
	cd test/dummy
	bin/rails db:setup
	cd ../../
	- name: Run tests
	run: bin/test

Provide feedback