Adding files from #652. #747

	# This link check is run on all PRs but just for the files that were changed/added in the PR itself.
	# Otherwise we had it too often that PR authors would see a failing link check that had nothing to do with their PR.

	name: Link Check PR

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

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

	- name: Get changed files
	id: changed-files
	uses: tj-actions/changed-files@v44

	- name: Filter markdown files only
	run: \|
	md_files=`find ${{ steps.changed-files.outputs.all_changed_files }} -maxdepth 0 -name "*.md" \| tr '\n' ' '`
	echo "MARKDOWN_FILES=$md_files" >> $GITHUB_ENV

	- name: Restore lychee cache
	uses: actions/cache@v4
	with:
	path: .lycheecache
	key: cache-lychee-${{ github.sha }}
	restore-keys: cache-lychee-

	- if: ${{ env.MARKDOWN_FILES != '' }}
	name: Link Checker
	uses: lycheeverse/lychee-action@v1.5.2
	with:
	args: --verbose --no-progress --exclude-mail --cache --max-cache-age 1d $MARKDOWN_FILES
	fail: true
	jobSummary: true
	env:
	GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

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