Don't use tty in non interactive env #226

	---
	# Check commits and incoming PRs that change workflows under .github/workflows/.
	name: Check GitHub workflows

	'on':
	push:
	paths:
	- '.github/workflows/*.yml'
	pull_request:
	paths:
	- '.github/workflows/*.yml'
	types:
	- opened
	- reopened
	- edited
	- ready_for_review
	- synchronize

	permissions: {}

	jobs:
	actionlint:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

	- name: Install prerequisites
	run: \|
	sudo apt update -y
	sudo apt install -y shellcheck pyflakes3
	# Install actionlint separately. It's not packaged, unfortunately.
	mkdir ~/bin
	curl -fSsL "$ACTIONLINT_URL" \| tar -xvvzC ~/bin actionlint
	echo ~/bin >> "$GITHUB_PATH"
	env:
	ACTIONLINT_URL: \|-
	https://github.com/rhysd/actionlint/releases/download/v1.7.1/actionlint_1.7.1_linux_amd64.tar.gz

	- name: Check GitHub workflows
	run: \|
	actionlint -pyflakes="$(command -v pyflakes3)" \
	-format "$GITHUB_FORMAT" .github/workflows/*.yml
	env:
	GITHUB_FORMAT: >-
	{{range $e := .}}::error file={{$e.Filepath}},line={{$e.Line}},col={{$e.Column}}::{{$e.Message}}%0A```%0A{{replace $e.Snippet "\\n" "%0A"}}%0A```\n{{end}}

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