Set PIP_PREFER_BINARY for build testenv #433

	# This file is managed by 'repo_helper'. Don't edit it directly.
	---
	name: Flake8

	on:
	push:
	branches-ignore:
	- 'repo-helper-update'
	- 'pre-commit-ci-update-config'
	- 'imgbot'
	pull_request:

	permissions:
	contents: read

	jobs:
	Run:
	name: "Flake8"
	runs-on: "ubuntu-20.04"

	steps:
	- name: Checkout 🛎️
	uses: "actions/checkout@v3"

	- name: Check for changed files
	uses: dorny/paths-filter@v2
	id: changes
	with:
	list-files: "json"
	filters: \|
	code:
	- '!(doc-source/**\|CONTRIBUTING.rst\|.imgbotconfig\|.pre-commit-config.yaml\|.pylintrc\|.readthedocs.yml)'

	- name: Setup Python 🐍
	if: steps.changes.outputs.code == 'true'
	uses: "actions/setup-python@v4"
	with:
	python-version: "3.6"

	- name: Install dependencies 🔧
	if: steps.changes.outputs.code == 'true'
	run: \|
	python -VV
	python -m site
	python -m pip install --upgrade pip setuptools wheel
	python -m pip install tox~=3.0

	- name: "Run Flake8"
	if: steps.changes.outputs.code == 'true'
	run: "python -m tox -e lint -s false -- --format github"

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