ci: run shellcheck on every pull request (#10) #4

	---
	name: ShellCheck

	'on':
	pull_request:
	push:
	branches: [main]

	permissions:
	contents: read

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	shellcheck:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Install ShellCheck
	run: \|
	sudo apt-get update
	sudo apt-get install -y shellcheck
	- name: Run ShellCheck
	shell: bash
	run: \|
	set -euo pipefail
	mapfile -t files < <(git ls-files \
	'*/.sh' \
	'*/.bash' \
	'*/.zsh' \
	'**/.bashrc' \
	'**/.bash_aliases' \
	'**/.zshrc' \
	'**/.profile')
	if [ "${#files[@]}" -eq 0 ]; then
	echo "No shell files to check."
	exit 0
	fi
	echo "Checking ${#files[@]} file(s) with ShellCheck..."
	shellcheck -S error -x "${files[@]}"

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