github: Add format check. #6

	name: 'Format Check'

	on:
	push:
	branches:
	- 'main'
	paths:
	- '*/.c'
	- '*/.cpp'
	- '*/.h'
	- '*/.hpp'

	pull_request:
	types:
	- opened
	- edited
	- reopened
	- synchronize
	branches:
	- 'main'
	paths:
	- '*/.c'
	- '*/.cpp'
	- '*/.h'
	- '*/.hpp'

	workflow_dispatch:
	inputs:
	logLevel:
	description: 'Log level'
	required: true
	default: 'warning'

	jobs:
	format-check:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v4
	with:
	submodules: false
	persist-credentials: false

	- name: Install clang-format
	run: \|
	sudo apt-get update
	sudo apt-get install -y clang-format colordiff

	- name: Get changed files
	id: changed-files
	uses: tj-actions/changed-files@v46
	with:
	files: \|
	cores/arduino/*/.{c,cpp,cc,cxx,h,hpp}
	!cores/arduino/api/**
	loader/*/.{c,cpp,cc,cxx,h,hpp}
	!loader/llext_exports.c
	libraries/*/.{c,cpp,cc,cxx,h,hpp}

	- name: Run clang-format check
	if: steps.changed-files.outputs.any_changed == 'true'
	run: \|
	clang-format --version
	exit_code=0

	for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
	file_fmt="${file}.tmp"
	clang-format ${file} > ${file_fmt}
	diff -q -u ${file} ${file_fmt} >> /dev/null 2>&1 \|\| {
	echo "❌ Formatting issues found in: $file"
	colordiff -u ${file} ${file_fmt} \|\| true
	exit_code=1
	}
	done

	exit $exit_code

Provide feedback