Simplify toolchain files, update cross build docs. #258

	# Simple workflow for building documentation for PR testing
	name: Build documentation

	# On a pull request this will build the html documentation
	# and create an artifact. It does this by using the cmake
	# build target doc_html. Note that this requires installing a little
	# more than is technically required for building the documentation in
	# order to satisfy our current cmake configurations e.g. spirv-tools
	on:
	pull_request:
	paths:
	- doc/**
	- .github/workflows/docs.yml

	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:

	permissions: {}

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

	- uses: actions/setup-python@v5
	with:
	python-version: 3.9

	- name: Install apt package
	run: \|
	sudo apt-get update
	sudo apt-get install -y doxygen virtualenv

	- name: Install prerequisites
	run: python -m pip install -r doc/requirements.txt

	- name: Build Documentation
	working-directory: ${{github.workspace}}
	run: \|
	cmake -DCA_ENABLE_API=cl -DCMAKE_BUILD_TYPE=Debug -DCA_RUNTIME_COMPILER_ENABLED=OFF -DCA_CL_ENABLE_OFFLINE_KERNEL_TESTS=OFF -DOCL_EXTENSION_cl_khr_il_program=OFF -Bbuild_doc
	cmake --build build_doc --target doc_html

	- name: Upload artifact
	uses: actions/upload-pages-artifact@v3
	with:
	path: ${{github.workspace}}/build_doc/doc/html

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