chore(ci): enforce clippy and `cargo fmt` in CI #4

	name: Clippy

	on:
	pull_request:
	merge_group:
	push:
	branches:
	- master

	# This will cancel previous runs when a branch or PR is updated
	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	clippy:
	name: cargo clippy
	runs-on: ${{ matrix.runner }}
	timeout-minutes: 30
	env:
	CACHED_PATHS: \|
	~/.cargo/bin/
	~/.cargo/registry/index/
	~/.cargo/registry/cache/
	~/.cargo/git/db/
	target/

	strategy:
	fail-fast: false
	matrix:
	include:
	- runner: ubuntu-latest
	target: x86_64-unknown-linux-gnu

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Restore cargo cache
	uses: actions/cache/restore@v3
	id: cache
	with:
	path: ${{ env.CACHED_PATHS }}
	key: ${{ matrix.target }}-cargo-test-${{ hashFiles('**/Cargo.lock') }}

	- name: Setup toolchain
	uses: dtolnay/rust-toolchain@master
	with:
	toolchain: stable # We do not use MSRV so we can benefit from newer lints
	targets: ${{ matrix.target }}
	components: clippy, rustfmt

	- name: Run `cargo clippy`
	run: cargo clippy --workspace --locked --release

	- name: Run `cargo fmt`
	run: cargo fmt --all --check

	- uses: actions/cache/save@v3
	# Write a cache entry even if the tests fail but don't create any for the merge queue.
	if: ${{ always() && steps.cache.outputs.cache-hit != 'true' && github.event_name != 'merge_group' }}
	with:
	path: ${{ env.CACHED_PATHS }}
	key: ${{ steps.cache.outputs.cache-primary-key }}

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