[Docs Site] Post build errors as PR comments #46731

	name: CI

	on:
	pull_request:
	branches:
	- production

	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	compile:
	name: Compiles
	runs-on: ubuntu-latest
	defaults:
	run:
	shell: bash --noprofile --norc -eo pipefail {0}
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 1
	- uses: actions/setup-node@v4
	with:
	node-version: 22
	cache: "npm"
	- uses: actions/cache/restore@v4
	with:
	path: \|
	node_modules/.astro
	key: static

	- run: npm ci \|& tee -a build.log

	- run: npm run check
	- run: npm run format:core:check
	## TODO: content formatting checks
	- run: npm run build \|& tee -a build.log
	env:
	NODE_OPTIONS: "--max-old-space-size=4192"
	RUN_LINK_CHECK: true

	- run: npm run check:worker

	- uses: actions/cache/save@v4
	with:
	path: \|
	node_modules/.astro
	key: static

	- name: Check - Validate redirects (infinite loops, sources with fragment)
	run: npx tsm bin/validate-redirects.ts

	- name: Tests
	run: npm run test

	- name: post build errors as PR comment
	if: failure()
	env:
	GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	# remove ANSI colours & try find some known error strings
	ERRORS=$(cat build.log \| sed 's/\x1B\[[0-9;][A-Za-z]//g' \| awk 'tolower($0) ~ /\[.error.*\]\|npm err\|\[vite\] error /,0')

	if [ -n "$ERRORS" ]; then
	URL=$(gh run view ${{ github.run_id }} --json url --jq '.url')
	BODY="[Build failed]($URL)\n\n\`\`\`txt\n$ERRORS\n\`\`\`"

	echo -e "$BODY" \| gh pr comment ${{ github.event.number }} --repo ${{ github.repository }} --body-file -
	fi

Provide feedback