Add `env()` function #1295

	name: Docs CI
	on:
	pull_request:
	types: [opened, reopened, synchronize]
	paths:
	- 'docs/**'
	workflow_dispatch:
	jobs:
	docs-build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v4
	with:
	python-version: '3.9'

	- name: Test docs build
	run: \|
	cd docs/
	pip install -r requirements.txt
	make clean html

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