Add `tox -e lint` to GHA #6

	name: Autoformat code and metadata
	on:
	workflow_dispatch:
	pull_request:
	branches: [ master ]
	jobs:
	run-and-apply:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout main branch
	uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.ref }}
	- name: Install dependencies
	run: pip install --upgrade pip setuptools wheel "tox<4.0.0"
	- name: Permission workaround
	run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
	- name: Run formatter
	run: tox -e lint
	- name: Commit all changes
	run: \|
	if [[ `git status --porcelain` ]]; then
	git config --global user.name "github-actions[bot]"
	git config --global user.email "github-actions[bot]@users.noreply.github.com"
	git add .
	git commit -m "Apply code formatting"
	git push
	fi
	- uses: actions/setup-python@v5
	with:
	python-version: '3.9'
	- name: Install test requirements
	run: \|
	python3 -m pip install -r requirements.txt
	- name: Run tests
	run: \|
	make test

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