Install with package manager

Description:

Currently, if we use poetry, we have to write two steps:

      - name: Install poetry
        run: pipx install poetry

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: ...
          cache: poetry

I hope this can be easier:

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: ...
          package-manager: poetry@{version}
          cache: poetry

首先检查 actions/setup-python@v4 入口点，以及其当前的 cache: poetry 设置如何处理单独的 Poetry 安装步骤。定义 package-manager 输入及其版本行为，然后验证 workflow 能否通过单个 setup 步骤安装所请求的 Poetry 版本，同时保留依赖缓存。