feat: enable future-compatible deployments

Free-threaded builds are exempt from abi3 builds

Author: 2bndy5

.gitignore

@@ -6,6 +6,7 @@
 /build/
 /ci/
 /dist/
+/wheelhouse/
 /docs/_build/
 /MANIFEST
 /venv*

setup.py

@@ -28,6 +28,7 @@
 # Import setuptools before distutils to avoid user warning
 import os
 import sys
+import sysconfig
 from distutils import log  # type: ignore[attr-defined]
 from distutils.command.build import build
 from distutils.command.sdist import sdist
@@ -152,6 +153,16 @@ def run(self) -> None:
     cmdclass=cmdclass,
     cffi_modules=['pygit2/_run.py:ffi'],
     ext_modules=ext_modules,
+    options={
+        'bdist_wheel': {
+            # for ABI3 (future-compatible) wheels.
+            # NOTE: free-threaded CPython builds do not support the limited API yet.
+            # See https://github.com/python/cpython/issues/111506
+            'py_limited_api': False
+            if sysconfig.get_config_var('Py_GIL_DISABLED')
+            else 'cp310'  # should correspond to `python_requires` below
+        }
+    },
     # Requirements
     python_requires='>=3.10',
     setup_requires=['cffi>=2.0'],