Add CI workflow to publish a continuous release #228

	# https://github.com/git/git/blob/master/.github/workflows/check-whitespace.yml

	name: Check Whitespaces

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

	on:
	pull_request:
	types: [opened, synchronize]

	jobs:
	check-whitespace:
	runs-on: ubuntu-latest
	steps:
	- name: Set commit count
	shell: bash
	run: echo "COMMIT_DEPTH=$((1+$COMMITS))" >>$GITHUB_ENV
	env:
	COMMITS: ${{ github.event.pull_request.commits }}

	- uses: actions/checkout@v2
	with:
	fetch-depth: ${{ env.COMMIT_DEPTH }}

	- 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.commits}})

	if test -n "${log}"
	then
	echo "::set-output name=checkout::"${log}""
	exit 2
	fi

	- name: Add Check Output as Comment
	uses: actions/github-script@v3
	id: add-comment
	env:
	log: ${{ steps.check_out.outputs.checkout }}
	with:
	script: \|
	await github.issues.createComment({
	issue_number: context.issue.number,
	owner: context.repo.owner,
	repo: context.repo.repo,
	body: `Whitespace errors found in workflow ${{ github.workflow }}:\n\n\`\`\`\n${process.env.log.replace(/\\n/g, "\n")}\n\`\`\``
	})
	if: ${{ failure() }}

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