Bump actions/checkout from 3 to 4 #13

	# MaCFP workflow

	name: Line_Endings

	# Controls when the workflow will run
	on:
	# Triggers the workflow on push or pull request events but only for the master branch
	push:
	pull_request:

	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "build"
	check-line-endings:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v4

	- name: Check for CRLF line endings
	run: \|
	{ grep -IUlr --exclude={".pdf",".png"} --exclude-dir=".git" $'\r' > tmp.txt \|\| true; }
	nlines=$(cat tmp.txt \| wc -l)
	if [ $nlines -gt 0 ]; then
	echo "matl-db repo text files with dos line endings:"
	cat tmp.txt
	exit 1
	fi

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