Add pyproject.toml to ansible sdist

changelogs/fragments/471.yaml

@@ -0,0 +1,7 @@
+---
+minor_changes:
+  - Add ``pyproject.toml`` to ansible sdist to use the
+    ``setuptools.build_meta`` `PEP 517 <https://peps.python.org/pep-0517/>`__
+    backend. Tools that still call ``setup.py`` directly will work the same as
+    they did before
+    (https://github.com/ansible-community/antsibull/pull/471).

src/antsibull/build_ansible_commands.py

@@ -151,6 +151,10 @@ def copy_boilerplate_files(package_dir: str) -> None:
     with open(os.path.join(package_dir, 'README.rst'), 'wb') as f:
         f.write(readme)
 
+    pyproject_toml = get_antsibull_data('pyproject.toml')
+    with open(os.path.join(package_dir, 'pyproject.toml'), 'wb') as f:
+        f.write(pyproject_toml)
+
 
 def write_manifest(package_dir: str,
                    release_notes: t.Optional[ReleaseNotes] = None,

src/antsibull/data/pyproject.toml

@@ -0,0 +1,7 @@
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or
+# https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+# SPDX-FileCopyrightText: 2022 Maxwell G <gotmax@e.email>
+[build-system]
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"