Add yamlfmt to pre-commit #472

	---
	name: CI docs

	on:
	# NOTE: github.event context is push payload:
	# https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#push
	push:
	branches:
	- main
	paths:
	- .github/workflows/docs.yml
	- docs/**

	# NOTE: github.event context is pull_request payload:
	# https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#pull_request
	pull_request:
	paths:
	- .github/workflows/docs.yml
	- docs/**

	jobs:
	docs:
	if: '!github.event.repository.fork'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
	with:
	fetch-depth: 0
	- name: Setup
	run: \|
	make env-docs
	- name: Build the docs
	run: \|
	cd docs
	conda run --name conda-build-docs make html

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