add CI test for clang formatting #6

	# SPDX-FileCopyrightText: 2025 CERN
	# SPDX-License-Identifier: Apache-2.0


	name: Clang-Format Check

	on: [pull_request, push]

	jobs:
	clang-format-check:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	# 1) Add the official LLVM repository for clang-format
	- name: Add LLVM apt repo
	run: \|
	wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key \| sudo apt-key add -
	sudo add-apt-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy main"
	sudo apt-get update

	# 2) Install latest version
	- name: Install clang-format
	run: \|
	sudo apt-get install -y clang-format
	clang-format --version

	# 3) Check formatting
	- name: Check formatting
	run: \|
	# Specify file extensions to be checked
	FILES=$(git ls-files '.cpp' '.h' '.cu' '.cuh' '.hh' '.cc' '*.icc')

	# '-n' checks if files need reformatting
	# '--Werror' throws an error if formatting is incorrect
	clang-format -style=file -n --Werror $FILES

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