add lecture youtube links #164

	name: QualityControl

	on:
	pull_request:
	branches:
	- main

	jobs:
	quality-control:
	runs-on: ubuntu-latest
	defaults:
	run:
	shell: bash -l {0}

	steps:
	- uses: actions/checkout@v3

	- uses: ./.github/actions/setupconda

	- name: Install NB-Clean
	run: \|
	pip install nb-clean==2.0.2

	- name: Ensure clean notebooks
	run: \|
	python .github/workflows/ensure_clean_notebooks.py

	# NOTE: this isn't a comprehensive spellcheck, just common typos
	- name: Spellcheck
	if: always()
	uses: codespell-project/actions-codespell@master
	with:
	check_filenames: true
	skip: '.js,.css,qaqc.yml,*.geojson'
	ignore_words_file: .codespellignore
	only_warn: 1

	# borrowed from https://github.com/ProjectPythia/pythia-foundations/blob/main/.github/workflows/link-checker.yaml
	- name: Disable Notebook Execution Before Linkcheck
	if: always()
	shell: python
	run: \|
	import yaml
	with open('./book/_config.yml') as f:
	data = yaml.safe_load(f)
	data['execute']['execute_notebooks'] = 'off'
	with open('./book/_config.yml', 'w') as f:
	yaml.dump(data, f)

	- name: Check External Links
	continue-on-error: true
	timeout-minutes: 5
	if: always()
	run: \|
	jb build book --builder linkcheck

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