Cache poetry itself #1153

	name: Build the package

	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- master

	jobs:
	build:
	name: Build
	strategy:
	matrix:
	os: [macos-latest, ubuntu-latest, windows-latest]
	python-version: ["3.9"]
	fail-fast: false

	runs-on: ${{ matrix.os }}
	steps:
	- name: Check out the repository
	uses: actions/checkout@v4

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}

	- name: Update PATH
	if: matrix.os == 'macos-latest'
	run: echo "$(python3 -m site --user-base)/bin" >> $GITHUB_PATH

	- name: Install Poetry
	run: \|
	pip --version
	pip install --user pipx
	pipx install poetry
	pipx list

	- name: Use local virtual environment
	run: \|
	poetry config virtualenvs.create true --local
	poetry config virtualenvs.in-project true --local

	- uses: actions/cache@v4
	id: cache-poetry-deps
	name: Cache Poetry dependencies
	with:
	path: ./.venv
	key: venv-${{ matrix.os }}-${{ matrix.python-version }}-${{ hashFiles('poetry.lock') }}
	restore-keys: \|
	venv-${{ matrix.os }}-${{ matrix.python-version }}-

	- name: Install dependencies with Poetry
	run: poetry install

	- name: List Poetry environment
	run: \|
	python3 --version
	poetry env info

	- name: Check if package builds
	run: \|
	poetry build

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