Bump actions/checkout from 3 to 4 #4

	name: CI
	on: push

	jobs:
	tests:
	name: Tests (Rust ${{ matrix.rustup-toolchain }}, Ruby ${{ matrix.ruby-version }})
	runs-on: ubuntu-latest

	strategy:
	matrix:
	rustup-toolchain:
	- stable
	- "1.51"
	ruby-version:
	- "2.6"
	- "2.7"
	- "3.0"
	- "3.1"
	- "3.2"

	steps:
	- name: Check out code
	uses: actions/checkout@v4

	- name: Set up Ruby and Rust
	uses: oxidize-rb/actions/[email protected]
	with:
	rustup-toolchain: ${{ matrix.rustup-toolchain }}
	ruby-version: ${{ matrix.ruby-version }}
	cache-version: v2
	cargo-cache: true

	- uses: Swatinem/rust-cache@v1

	- name: Run tests
	run: cargo test

	clippy:
	name: Clippy
	runs-on: ubuntu-latest

	steps:
	- name: Check out code
	uses: actions/checkout@v4

	- name: Set up Rust
	uses: actions-rs/toolchain@v1
	with:
	toolchain: stable
	components: clippy
	override: true

	- uses: Swatinem/rust-cache@v1

	- name: Run Clippy
	run: cargo clippy --no-deps -- -D warnings

	rustfmt:
	name: rustfmt
	runs-on: ubuntu-latest

	steps:
	- name: Check out code
	uses: actions/checkout@v4

	- name: Set up Rust
	uses: actions-rs/toolchain@v1
	with:
	toolchain: stable
	components: rustfmt
	override: true

	- name: Check formatting
	run: cargo fmt --all -- --check

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