Exempt the Speculation-Rules header from CSP #139

	name: Preview
	on:
	pull_request:
	paths:
	- '**.bs'
	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	env:
	PULL_NUMBER: "${{ github.event.number }}"
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 2
	- name: Build (head)
	run: \|
	make ci
	mkdir -p upload
	mv out upload/head
	- name: Build (base)
	id: build_base
	continue-on-error: true
	run: \|
	git checkout HEAD^
	make ci
	mv out upload/base
	- name: Checkout w3c/htmldiff-ui
	if: ${{ steps.build_base.outcome == 'success' }}
	uses: actions/checkout@v4
	with:
	repository: w3c/htmldiff-ui
	ref: refs/heads/main
	path: htmldiff-ui
	- name: Diff
	if: ${{ steps.build_base.outcome == 'success' }}
	shell: bash
	run: \|
	mkdir -p upload/diff
	for head_file in $(find upload/head -name '*.html'); do
	base_file=upload/base/"${head_file#upload/head/}"
	diff_file=upload/diff/"${head_file#upload/head/}"
	if [[ -e "$base_file" ]]; then
	if cmp -s "$head_file" "$base_file"; then
	rm "$base_file" "$head_file"
	else
	perl htmldiff-ui/htmldiff.pl "$base_file" "$head_file" "$diff_file"
	fi
	fi
	done
	- name: Compress
	shell: bash
	run: \|
	which brotli >/dev/null \|\| sudo apt-get install -y brotli
	mkdir -p upload-compressed/{base,head,diff}
	for file in $(find upload -name '*.html'); do
	dir=`dirname upload-compressed/"${file#upload/}"`
	mkdir -p "$dir"
	brotli "$file" -o upload-compressed/"${file#upload/}"
	done
	echo -n "$PULL_NUMBER" >upload-compressed/.pull-number
	- name: Upload artifact
	uses: actions/upload-artifact@v4
	with:
	name: upload-compressed
	path: upload-compressed/
	include-hidden-files: true

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