further simplify README and rewrite introduction of a book. #74

	name: Rust

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

	env:
	CARGO_TERM_COLOR: always
	TESTCONTAINER_DOCKER_NETWORK: tomodachi-testcontainers

	jobs:
	build:
	runs-on: ubuntu-latest

	services:
	postgres:
	image: postgres:latest
	env:
	POSTGRES_USER: postgres
	POSTGRES_PASSWORD: postgres
	POSTGRES_DB: postgres
	ports:
	- 5432:5432
	options: >-
	--health-cmd pg_isready
	--health-interval 10s
	--health-timeout 5s
	--health-retries 5

	steps:
	- uses: actions/checkout@v4
	- uses: Swatinem/rust-cache@v2
	- name: Build
	run: cargo build
	- name: Run tests
	run: cargo test
	env:
	DATABASE_URL: postgres://postgres:postgres@localhost:5432/postgres

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