Use dtolnay/rust-toolchain to get old toolchain in CI (#140) #2

	name: Tests

	permissions:
	contents: read

	on:
	push:
	branches:
	- main
	pull_request:

	# see https://matklad.github.io/2021/09/04/fast-rust-builds.html
	env:
	CARGO_TERM_COLOR: always
	CARGO_INCREMENTAL: 0
	CARGO_NET_RETRY: 10
	CI: 1
	RUST_BACKTRACE: short
	RUSTFLAGS: "-W rust-2021-compatibility"
	RUSTUP_MAX_RETRIES: 10
	CARGO_MUTANTS_MINIMUM_TEST_TIMEOUT: 60

	jobs:
	build:
	strategy:
	matrix:
	os: [macOS-latest, ubuntu-latest, windows-latest]

	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/checkout@v3
	- name: Show Cargo and rustc version
	run: \|
	cargo --version
	rustc --version
	- uses: Swatinem/rust-cache@v2
	- name: rustfmt
	run: cargo fmt --all -- --check
	- name: Build
	run: cargo build --all-targets
	- name: Test
	run: cargo test --workspace
	- name: Install
	run: cargo install --path .

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