ci: Add workflow to ensure Rust code is consistently formatted #3

	# Make sure Rust source code is consistently formatted with rustfmt.

	name: "lint-cargo-fmt.yml"

	on:
	pull_request: {}

	concurrency:
	group: "${{ github.workflow }}:${{ github.event.pull_request.number }}"
	cancel-in-progress: true

	jobs:
	format-check:
	name: "Check formatting for Rust code"
	runs-on: "ubuntu-latest"
	steps:
	- name: "Install Rust toolchain"
	uses: "dtolnay/rust-toolchain@stable"
	with:
	toolchain: "nightly"
	components: "rustfmt"

	- name: "Checkout"
	uses: "actions/checkout@v4"
	with:
	fetch-depth: "1"
	persist-credentials: "false"

	- name: "Check formatting"
	run: \|
	cargo fmt --check

	- name: "How to fix"
	if: ${{ failure() }}
	run: \|
	echo "::notice::Try fixing the issue with 'cargo fmt --all', then commit the changes."

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