Add hint about libjpeg, libwebp, libavif, ... #842

	name: "Build docs"

	on:
	pull_request:
	push:
	branches:
	- '[0-9]+.x'
	- '[0-9]+.[0-9]+'

	jobs:
	docs:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- uses: actions/setup-python@v5
	with:
	python-version: '3.12'

	- name: Install Python requirements
	run: pip install -r requirements.txt

	- name: Sphinx Build
	run: sphinx-build -n -W --keep-going -b html -d _build/doctrees . _build/html

	- uses: actions/upload-artifact@v4
	with:
	name: DocumentationHTML
	path: "_build/html"

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