Add GitHub Actions workflow and poll_and_respond script for Slack Cha… #184

	name: Run pytype validation
	on:
	push:
	branches: [main]
	pull_request:
	jobs:
	build:
	runs-on: ubuntu-latest
	timeout-minutes: 5
	strategy:
	matrix:
	python-version: ["3.10"]
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Run pytype verification
	run: \|
	pip install -r requirements.txt
	pip install "pytype==2023.03.02" boto3 && pytype *.py

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