Run CI on PRs and if manually started #8

	---
	name: Python build
	on: [push, pull_request]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.9", "3.10", "3.11"]
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install flake8 pytest build
	- name: Lint with flake8
	run: flake8 . --count --exit-zero
	- name: Install tilekiln
	run: python -m pip install -e .
	- name: Test with pytest
	run: pytest

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