Bump actions/checkout from 3 to 4 #52

	on: [push, pull_request]

	name: Rust CI

	jobs:
	ci:
	if: "!contains(github.event.head_commit.message, 'ci skip')"
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [macos-latest, ubuntu-latest, windows-latest]
	rust: [stable, beta, nightly]

	steps:
	- uses: actions/checkout@v4
	with:
	submodules: "recursive"

	- name: Cache cargo registry
	uses: actions/cache@v3
	with:
	path: ~/.cargo/registry
	key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
	restore-keys: ${{ runner.os }}-cargo-registry-

	- name: Cache cargo index
	uses: actions/cache@v3
	with:
	path: ~/.cargo/git
	key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
	restore-keys: ${{ runner.os }}-cargo-index-

	- name: Cache cargo build
	uses: actions/cache@v3
	with:
	path: target
	key: ${{ runner.os }}-${{ matrix.rust }}-build-target-${{ hashFiles('**/Cargo.lock') }}
	restore-keys: ${{ runner.os }}-${{ matrix.rust }}-build-target-

	- uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: ${{ matrix.rust }}
	override: true
	components: rustfmt, clippy

	- uses: actions-rs/cargo@v1
	with:
	command: build

	- uses: actions-rs/cargo@v1
	with:
	command: test
	args: --all

	- uses: actions-rs/cargo@v1
	with:
	command: fmt
	args: --all -- --check

	- uses: actions-rs/cargo@v1
	with:
	command: clippy
	args: -- -D warnings

Provide feedback