Replace Matrix and Slack links to Swung's Mattermost #299

	name: build-html

	on:
	pull_request:
	push:
	branches:
	- main
	schedule:
	# * is a special character in YAML so you have to quote this string
	# Run every Monday at 12:00 UTC
	- cron: '00 12 * * 1'

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE
	- name: Checkout
	uses: actions/checkout@v2

	- name: Setup Python
	uses: actions/setup-python@v2
	with:
	python-version: '3.9'

	- name: Install requirements
	run: pip install -r requirements.txt

	- name: Build the website
	run: make html

	- name: Disable Jekyll builds on GitHub pages
	run: touch _build/html/.nojekyll

	- name: Set the CNAME file for our custom domain
	run: echo "www.fatiando.org" > _build/html/CNAME

	- name: Print a directory tree of the generated HTML for debugging
	run: tree -a _build/html

	- name: Push to fatiando.github.io
	if: success() && ( github.event_name == 'push' \|\| github.event_name == 'schedule' )
	# Don't use tags: https://julienrenaux.fr/2019/12/20/github-actions-security-risk/
	uses: peaceiris/actions-gh-pages@bbdfb200618d235585ad98e965f4aafc39b4c501
	with:
	deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
	external_repository: fatiando/fatiando.github.io
	publish_branch: master
	publish_dir: ./_build/html
	# Only keep the latest commit to avoid bloating the repository
	force_orphan: true
	user_name: 'github-actions[bot]'
	user_email: 'github-actions[bot]@users.noreply.github.com'

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