Updated README.md #14

	name: Deploy Book

	on:
	push:
	branches:
	- main

	jobs:
	build:
	runs-on: ubuntu-22.04

	steps:
	- name: Checkout repository
	uses: actions/checkout@v3

	- name: Install mdBook
	if: exists('book.toml')
Check failure on line 17 in .github/workflows/deploy.yml View workflow run for this annotation GitHub Actions / Deploy Book Invalid workflow file `The workflow is not valid. .github/workflows/deploy.yml (Line: 17, Col: 13): Unrecognized function: 'exists'. Located at position 1 within expression: exists('book.toml') .github/workflows/deploy.yml (Line: 22, Col: 13): Unrecognized function: 'exists'. Located at position 1 within expression: exists('book.toml')`
	run: \|
	curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.21/mdbook-v0.4.21-x86_64-unknown-linux-gnu.tar.gz \| tar -xz -C /usr/local/bin

	- name: Build the book
	if: exists('book.toml')
	run: mdbook build

	- name: Deploy to GitHub Pages
	uses: peaceiris/actions-gh-pages@v3
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_branch: gh-pages
	publish_dir: ./book

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