Update SECURITY.md #91

	# Based on https://github.com/rust-lang/mdBook/wiki/Automated-Deployment%3A-GitHub-Actions
	name: Deploy mdbook
	on:
	push:
	branches:
	- main

	jobs:
	deploy:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0
	- name: Install Rust
	run: \|
	curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \| sh -s -- -y
	echo "PATH=$HOME/.cargo/bin:$PATH" >> $GITHUB_ENV
	- name: Install mdbook and other preprocessors
	run: \|
	cargo install --locked mdbook-variables mdbook
	- 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 doc
	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/* .
	echo 'plrust.io' > CNAME
	git add .
	git commit -m "Deploy $GITHUB_SHA to gh-pages"
	git push --force --set-upstream origin gh-pages

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