ci: set gh-pages workflow to run on ubuntu-latest #10

	# Build the Sphinx docs on PR to catch any issues before merging.
	# Deployment happens on push/merge to main with gh-pages.yml
	name: Build Docs

	on:
	pull_request:
	branches: [main]
	paths: [docs/**]

	jobs:
	pages:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	with:
	fetch-depth: 0
	- name: Install requirements
	run: pip install -r docs/requirements.txt
	- name: Build docs
	run: make zkdocs

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