Auto merge of #12796 - dtolnay-contrib:switching, r=epage #1

	name: Contrib Deploy
	on:
	push:
	branches:
	- master

	permissions:
	contents: read

	jobs:
	deploy:
	permissions:
	contents: write # for Git to git push
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0
	- name: Install mdbook
	run: \|
	mkdir mdbook
	curl -Lf https://github.com/rust-lang/mdBook/releases/download/v0.4.27/mdbook-v0.4.27-x86_64-unknown-linux-gnu.tar.gz \| tar -xz --directory=./mdbook
	echo `pwd`/mdbook >> $GITHUB_PATH
	- name: Deploy docs
	run: \|
	cd src/doc/contrib
	mdbook build
	git worktree add gh-pages 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 contrib
	mv ../book contrib
	git add contrib
	git commit -m "Deploy $GITHUB_SHA to gh-pages"
	git push --force

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