Adding a cargo book #4

	name: Deploy Rust book
	on:
	# TODO put this back only when merging after this PR lands.
	pull_request:
	push:
	branches:
	- main

	jobs:
	deploy:
	runs-on: ubuntu-latest
	permissions:
	contents: write # To push a branch
	pull-requests: write # To create a PR from that branch
	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0
	- name: Install latest mdbook
	run: \|
	tag=$(curl 'https://github.com/repos/rust-lang/mdbook/releases/latest' \| jq -r '.tag_name')
	url="https://github.com/rust-lang/mdbook/releases/download/${tag}/mdbook-${tag}-x86_64-unknown-linux-gnu.tar.gz"
	mkdir mdbook
	curl -sSL $url \| tar -xz --directory=./mdbook
	echo `pwd`/mdbook >> $GITHUB_PATH
	- name: Deploy GitHub Pages
	run: \|
	# This assumes your book is in the root of your repository.
	# Just add a `cd` here if you need to change to another directory.
	cd candle-book
	mdbook build
	git worktree add gh-pages
	git config user.name "Deploy from CI"
	git config user.email ""
	cd gh-pages
	# Delete the ref to avoid keeping history.
	git update-ref -d refs/heads/gh-pages
	rm -rf *
	mv ../book/* .
	git add .
	git commit -m "Deploy $GITHUB_SHA to gh-pages"
	git push --force --set-upstream origin gh-pages

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