Update build.yml #50

	name: Build and deploy the Starterkit lessons website.
	on: push
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.7
	- name: Install dependencies
	run: pip install -vv starterkit-ci>=0.1.0
	- name: Build the website
	run: starterkit_ci build --allow-warnings
	- name: Check for dead links
	run: starterkit_ci check --allow-warnings
	- name: Upload build artifacts
	uses: actions/upload-artifact@v2
	with:
	name: build
	path: build/html/
	deploy:
	if: ${{ github.ref == 'refs/heads/master' }}
	runs-on: ubuntu-latest
	needs: build
	steps:
	- name: Download build artifacts
	uses: actions/download-artifact@v2
	with:
	name: build
	- name: Deploy
	uses: peaceiris/actions-gh-pages@v3
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: .

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