cibuildwheel with macOS (#17)

* Use cibuildwheel for all three: Linux, macOS and Windows
* Disable building for PyPy on macOS because it passes an unrecognised flag to the Apple linker
* Disable unit testing with cibuildwheel because PyPy does not support getting the reference count
  * The unit tests should eventually be modified to check the reference counts only on CPython.
  * Then test workflow can be removed and unit testing can be done with cibuildwheel.

Author: tfpf

.github/workflows/package.yml

@@ -2,50 +2,28 @@ name: package
 on: [push, workflow_dispatch]
 
 jobs:
-  # The Apple linker does not understand one of the flags cibuildwheel passes
-  # to it. Hence, use Hatch: it generates universal wheels.
-  build_macos:
+  build:
     strategy:
       matrix:
-        os: ['macos-14']
-        python: ['3.10', '3.11', '3.12', '3.13']
-    name: build on ${{ matrix.os }} with ${{ matrix.python }}
-    runs-on: ${{ matrix.os }}
-    steps:
-    - uses: actions/checkout@v4
-    - uses: actions/setup-python@v5
-      id: sp
-      with:
-        python-version: ${{ matrix.python }}
-    - run: pipx install hatch
-    - run: hatch build
-      env:
-        HATCH_PYTHON: ${{ steps.sp.outputs.python-path }}
-    - uses: actions/upload-artifact@v4
-      with:
-        name: wheel-${{ matrix.os }}-${{ matrix.python }}
-        path: dist/*.whl
-
-  # Hatch builds Linux wheels with a platform tag not permitted by PyPI. Hence,
-  # use cibuildwheel.
-  build_ubuntu_windows:
-    strategy:
-      matrix:
-        os: ['ubuntu-22.04', 'windows-2022']
+        os: ['macos-13', 'macos-14', 'ubuntu-22.04', 'windows-2022']
     name: build on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
     - run: pipx install cibuildwheel==2.21.3
     - run: cibuildwheel --output-dir wheelhouse
+      env:
+        # The Apple linker does not recognise one of the flags passed to it
+        # while building for PyPy. Skip it.
+        CIBW_SKIP: pp*-macosx*
     - uses: actions/upload-artifact@v4
       with:
-        name: wheel-${{ matrix.os }}-${{ strategy.job-index }}
+        name: wheels-${{ matrix.os }}-${{ strategy.job-index }}
         path: wheelhouse/*.whl
 
   release:
     if: github.ref_type == 'tag'
-    needs: [build_macos, build_ubuntu_windows]
+    needs: [build]
     runs-on: ubuntu-22.04
     permissions: write-all
     steps: