Add a GitHub action for periodically running vale and storing the results #42

	# The purpose of this workflow file is to confirm that the Sphinx
	# virtual environment can be built from source, consequently documenting
	# the packages required in the build environment to do that.
	#
	# This is needed because some projects embeds the documentation into built
	# artifacts which involves rendering the documentation on the target
	# architecture.
	#
	# Depending on the architecture, pip may or may not have already built wheels
	# available, and as such we need to make sure building wheels from source can
	# succeed.
	name: Check and document build requirements for Sphinx venv
	on:
	- push
	- pull_request
	- workflow_dispatch


	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	build:
	name: build
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Install dependencies
	run: \|
	set -ex
	sudo apt -y install \
	cargo \
	libpython3-dev \
	libxml2-dev \
	libxslt1-dev \
	make \
	python3-venv \
	rustc

	- name: Build Sphinx venv
	run: \|
	set -ex
	make -f Makefile.sp \
	sp-install \
	PIPOPTS="--no-binary :all:" \
	\|\| ( cat .sphinx/venv/pip_install.log && exit 1 )

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