Add blog post #171

	name: Validate Blog Posts

	on:
	pull_request:
	paths:
	- 'content/blog/**'

	permissions:
	contents: read

	jobs:
	validate:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v5
	with:
	fetch-depth: 2

	- name: Find changed blog posts
	id: changed
	run: \|
	# On pull_request events, HEAD is the merge commit.
	# HEAD~1 is the base branch tip, so this diff gives
	# exactly the PR's changes.
	CHANGED=$(git diff --name-only HEAD~1 -- 'content/blog/**/index.md' \
	\| { grep -E '/index\.md$' \|\| true; })

	if [ -z "$CHANGED" ]; then
	echo "found=false" >> "$GITHUB_OUTPUT"
	else
	echo "found=true" >> "$GITHUB_OUTPUT"
	echo "$CHANGED" > /tmp/changed-posts.txt
	fi

	- name: Install uv
	if: steps.changed.outputs.found == 'true'
	uses: astral-sh/setup-uv@v6

	- name: Run validation
	if: steps.changed.outputs.found == 'true'
	id: validate
	run: \|
	FILES=$(tr '\n' ' ' < /tmp/changed-posts.txt)
	EXIT_CODE=0
	uv run --quiet scripts/validate-blog-posts.py --format markdown \
	$FILES > /tmp/validation-report.md \|\| EXIT_CODE=$?
	echo "exit-code=$EXIT_CODE" >> "$GITHUB_OUTPUT"

	- name: Stash PR number with report
	if: steps.changed.outputs.found == 'true'
	run: \|
	mkdir -p /tmp/report
	cp /tmp/validation-report.md /tmp/report/report.md
	echo "${{ github.event.pull_request.number }}" > /tmp/report/pr-number.txt

	- name: Upload report
	if: steps.changed.outputs.found == 'true'
	uses: actions/upload-artifact@v4
	with:
	name: blog-validation-report
	path: /tmp/report/

	- name: Fail on errors
	if: steps.validate.outputs.exit-code != '0' && steps.changed.outputs.found == 'true'
	run: exit 1

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