Adding Link Check on PRs #4

	#Checks links in a PR to ensure they are valid. If link is valid but failing, it can be added to the .lycheeignore file
	#Code source: https://github.com/lycheeverse/lychee-action/issues/238

	name: link check on PR

	on:
	pull_request:
	branches: [main]

	jobs:
	check-links:
	runs-on: ubuntu-latest
	steps:
	- name: Clone repository
	uses: actions/checkout@v4
	with:
	fetch-depth: 0
	ref: ${{github.event.pull_request.head.ref}}
	repository: ${{github.event.pull_request.head.repo.full_name}}

	- name: Check out main branch
	run: git checkout main

	- name: Dump all links from main
	id: dump_links_from_main
	uses: lycheeverse/lychee-action@v1
	with:
	args: \|
	--dump
	--include-fragments
	.
	output: ./links-main.txt

	- name: Stash untracked files
	run: git stash push --include-untracked

	- name: Check out feature branch
	run: git checkout ${{ github.head_ref }}

	- name: Apply stashed changes
	# Apply stashed changes, ignore errors if stash is empty
	run: git stash pop \|\| true

	- name: Append links-main.txt to .lycheeignore
	run: cat links-main.txt >> .lycheeignore

	- name: Check links
	uses: lycheeverse/lychee-action@v1
	with:
	args: \|
	--no-progress
	--include-fragments
	.
	# Fail action on broken links
	fail: true

	- name: Suggestions
	if: failure()
	run: \|
	echo -e "\nPlease review the links reported in the Check links step above."
	echo -e "If a link is valid but fails due to a CAPTCHA challenge, IP blocking, login requirements, etc.,
	consider adding such links to .lycheeignore file to bypass future checks.\n"
	exit 1

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