add a predicates function to theory #6

	name: Build the manual with mdBook and deploy it

	on:
	push:
	branches: [ "master" ]

	# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
	permissions:
	contents: read
	pages: write
	id-token: write

	# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
	# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
	concurrency:
	group: "pages"
	cancel-in-progress: false

	jobs:
	deploy:

	environment:
	name: github-pages
	url: ${{ steps.deployment.outputs.page_url }}

	runs-on: ubuntu-latest

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

	- name: Install mdBook
	run: \|
	mkdir -p $HOME/.local/bin/
	curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.40/mdbook-v0.4.40-x86_64-unknown-linux-gnu.tar.gz \| tar -xz --directory=$HOME/.local/bin/

	- name: Build the manual
	run: \|
	cd res/manual
	mdbook build

	- name: Upload artifact
	uses: actions/upload-pages-artifact@v2
	with:
	path: './res/manual/book'

	- name: Deploy to GitHub Pages
	id: deployment
	uses: actions/deploy-pages@v2

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