add clang-format to github action #4

	name: "format code"

	# run on pull requests to develop
	on:
	pull_request:
	branches:
	- master
	push:
	branches:
	- master

	jobs:
	format:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v2
	with:
	# check out HEAD on the branch
	ref: ${{ github.head_ref }}
	# make sure the parent commit is grabbed as well, because
	# that's what will get formatted (i.e. the most recent commit)
	fetch-depth: 2
	# format the latest commit
	- uses: purduesigbots/clang-format-action@1
	# use one of clang-format's supported styles or leave this out to use the style in your .clang-format file
	with:
	style: .clang-format
	# commit the changes (if there are any)
	- name: Commit changes
	uses: stefanzweifel/[email protected]
	with:
	commit_message: apply clang-format changes
	branch: ${{ github.head_ref }}

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