Add MyPy type checking #1

	name: Python Type Check

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	on:
	pull_request:
	push:
	branches:
	- dev

	jobs:
	typecheck:
	name: mypy --strict (baseline)
	runs-on: ubuntu-latest
	timeout-minutes: 10

	steps:
	- uses: actions/checkout@v3

	- name: Setup Python
	uses: actions/setup-python@v3
	with:
	python-version: '3.10'

	- name: Cache pip
	uses: actions/cache@v3
	with:
	path: ~/.cache/pip
	key: typecheck-${{ runner.os }}-${{ hashFiles('requirements-dev.txt') }}
	restore-keys: typecheck-${{ runner.os }}-

	- name: Install type-check dependencies
	run: pip install -r requirements-dev.txt

	- name: Run mypy with baseline filter
	# Fails if any new violations are introduced beyond the frozen baseline.
	# To update the baseline after fixing violations, run locally:
	# python -m mypy -p aaz_dev \| python -m mypy_baseline sync
	# and commit the updated mypy-baseline.txt.
	run: python -m mypy -p aaz_dev \| python -m mypy_baseline filter

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