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Add scheme preview deploy workflow #1

	name: Scheme previews

	# Builds the current production site (main) at the root and hosts the four
	# redesign colour schemes under /preview/<scheme>/ so they can be compared side
	# by side. The live site at the root stays exactly as main produces it.

	on:
	push:
	branches: [redesign/previews]
	workflow_dispatch:

	permissions:
	contents: read
	pages: write
	id-token: write

	concurrency:
	group: pages
	cancel-in-progress: false

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout main (root site)
	uses: actions/checkout@v4
	with:
	ref: main
	path: root

	- uses: actions/setup-node@v4
	with:
	node-version: 20

	- name: Build root site (production, unchanged)
	working-directory: root
	run: \|
	npm ci
	npm run build
	mkdir -p "$GITHUB_WORKSPACE/_site"
	cp -r dist/. "$GITHUB_WORKSPACE/_site/"

	- name: Build scheme previews
	run: \|
	for s in cyan-ink ember light-editorial mono-lime; do
	rm -rf scheme
	git clone --depth 1 --branch "redesign/$s" \
	"https://x-access-token:${{ github.token }}@github.com/${{ github.repository }}.git" scheme
	(cd scheme && npm ci && PREVIEW_BASE="/preview/$s/" npm run build)
	mkdir -p "$GITHUB_WORKSPACE/_site/preview/$s"
	cp -r scheme/dist/. "$GITHUB_WORKSPACE/_site/preview/$s/"
	done

	- uses: actions/upload-pages-artifact@v3
	with:
	path: _site

	deploy:
	needs: build
	runs-on: ubuntu-latest
	environment:
	name: github-pages
	url: ${{ steps.deployment.outputs.page_url }}
	steps:
	- id: deployment
	uses: actions/deploy-pages@v4