Add sector-based sea ice analysis (#393) #1427

	name: Sphinx Builds
	on:
	push:
	pull_request:
	types: [synchronize, opened]
	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: '<=3.9'
	- name: Cache pip
	uses: actions/cache@v2
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
	restore-keys: \|
	${{ runner.os }}-pip-
	${{ runner.os }}-
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r docs/requirements.txt
	sudo apt-get update -y
	sudo apt-get install -y pandoc
	- name: Ensure sphinx builds (warnings allowed)
	run: \|
	cp -r DocumentedExamples/ docs/
	cp -r Tutorials/ docs/
	make -C docs html O=-n

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