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bump(cargo)!: 🚀 upgrades available #6305

	# Make sure Rust source code is consistently formatted with rustfmt.
	#
	# Uses the nix-shell environment to ensure the same rustfmt version
	# that developers use locally.

	name: "lint-cargo-fmt.yml"

	on:
	pull_request: {}
	merge_group:
	types: ["checks_requested"]

	concurrency:
	group: "${{ github.workflow }}:${{ github.event.pull_request.number \|\| github.event.after \|\| github.event.merge_group && github.run_id }}"
	cancel-in-progress: true

	permissions:
	contents: "read"

	jobs:
	format-check:
	name: "Check formatting for Rust code"
	runs-on: "lab"
	# Skip this job in merge group checks; but we need the workflow to run,
	# given that the status check is required for merging.
	if: "${{ github.event.pull_request }}"
	env:
	USER: "runner"
	steps:
	- name: "Checkout"
	uses: "actions/checkout@v6"
	with:
	fetch-depth: "1"
	persist-credentials: "false"

	- uses: "./.github/actions/nix-shell"
	with:
	cachix_signing_key: "${{ secrets.CACHIX_SIGNING_KEY }}"
	cachix_auth_token: "${{ secrets.CACHIX_AUTH_TOKEN }}"

	- name: "Check formatting"
	shell: "bash"
	run: \|
	set -euo pipefail
	just fmt --check

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