Add error handling prototype #5071

	name: Public API check

	on:
	pull_request:
	types: [opened, synchronize, reopened, labeled, unlabeled]
	branches:
	- main

	jobs:
	publicAPICheck:

	runs-on: ubuntu-latest

	if: "!contains(github.event.pull_request.labels.*.name, 'Approve Public API check')"

	steps:
	- name: Checkout the repo
	uses: actions/checkout@v2
	with:
	fetch-depth: 0

	- name: Checkout main
	run: git checkout main

	- name: Pull origin
	run: git pull --rebase=false origin main

	- name: Checkout pull request
	run: git checkout ${{ github.event.pull_request.head.sha }}

	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.9

	- name: Install tox
	run: pip install -U tox-factor

	- name: Public API Check
	run: tox -e public-symbols-check

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