add "polarcap" grid for cesm3 release #2734

	name: black check on push and PR
	#
	# Run the python formatting in check mode
	#
	on: [push, pull_request]

	jobs:
	black-check:
	runs-on: ubuntu-latest
	steps:
	# Checkout the code
	- uses: actions/checkout@v2
	# Use the latest stable version of the github action
	- uses: psf/black@stable
	with:
	# Use options and version identical to the conda environment
	# Using pyproject.toml makes sure this testing is consistent with our python directory testing
	options: "--check --config python/pyproject.toml"
	src: "./python"
	# Version should be coordinated with the ctsm_pylib conda environment under the python directory
	version: "22.3.0"
	# Actions identical to above for each directory and source file we need to check (arrays aren't allowed for src: field)
	- uses: psf/black@stable
	with:
	options: "--check --config python/pyproject.toml"
	src: "./cime_config/SystemTests"
	version: "22.3.0"
	- uses: psf/black@stable
	with:
	options: "--check --config python/pyproject.toml"
	src: "./cime_config/buildlib"
	version: "22.3.0"
	- uses: psf/black@stable
	with:
	options: "--check --config python/pyproject.toml"
	src: "./cime_config/buildnml"
	version: "22.3.0"

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