ci: Add a clang-ast workflow #614

	name: Check Whitespace

	# Get the repo with the commits(+1) in the series.
	# Process `git log --check` output to extract just the check errors.

	on:
	pull_request:
	types: [ opened, synchronize ]

	jobs:
	check-whitespace:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: git log --check
	id: check_out
	run: \|
	log=
	commit=
	while read dash etc
	do
	case "${dash}" in
	"---")
	commit="${etc}"
	;;
	"")
	;;
	*)
	if test -n "${commit}"
	then
	log="${log}\n${commit}"
	echo ""
	echo "--- ${commit}"
	fi
	commit=
	log="${log}\n${dash} ${etc}"
	echo "${dash} ${etc}"
	;;
	esac
	done <<< $(git log --check --pretty=format:"--- %h %s" ${{github.event.pull_request.base.sha}}..)

	if test -n "${log}"
	then
	exit 2
	fi

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