Add option to skip clang-format execution #101

	name: Unix

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

	jobs:
	build:

	runs-on: macos-latest

	steps:
	- uses: actions/checkout@v2

	- name: Configure and build without format dependencies
	run: \|
	cmake -Htest -Bbuild
	cmake --build build
	./build/test
	! cmake --build build --target format

	- name: Install format dependencies
	run: \|
	brew install clang-format
	pip3 install cmake_format==0.6.11 pyyaml

	- name: Configure
	run: cmake -Htest -Bbuild

	- name: Run format
	run: "cmake --build build --target format"

	- name: Check clang-format
	run: "! cmake --build build --target check-clang-format"

	- name: Check cmake-format
	run: "! cmake --build build --target check-cmake-format"

	- name: Check format
	run: "! cmake --build build --target check-format"

	- name: Fix format
	run: cmake --build build --target fix-format

	- name: Check fixed format
	run: cmake --build build --target check-format && ! git diff --exit-code

	- name: Configure cmake-format with excluded file
	run: \|
	git reset --hard HEAD
	cmake -Htest -Bbuild -DCMAKE_FORMAT_EXCLUDE="(^\|/)sample\\.cmake$"

	- name: Fix cmake-format skipping excluded file
	run: cmake --build build --target fix-cmake-format

	- name: Check cmake-format with excluded file
	run: cmake --build build --target check-cmake-format && ! git diff --exit-code -- test/CMakeLists.txt && git diff --exit-code -- test/sample.cmake

Provide feedback