Build: Add separate abi3 build job.

Author: scoder

.github/workflows/wheels.yml

@@ -151,9 +151,59 @@ jobs:
           path: ./wheelhouse/*.whl
           name: wheel-${{ matrix.only }}
 
+  build_limited_api_wheels:
+    name: Build Stable ABI wheels on ${{ matrix.os }}
+    if: >-
+      github.event_name == 'push' ||
+      github.event_name == 'release' ||
+      (github.event_name == 'schedule' && github.repository == 'cython/cython') ||
+      github.event_name == 'workflow_dispatch'
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - 'ubuntu-latest'
+          - 'ubuntu-24.04-arm'
+          - 'windows-latest'
+          - 'windows-11-arm'
+          - 'macos-latest'
+
+    steps:
+      - name: Checkout Cython
+        uses: actions/checkout@v6
+
+      - uses: actions/setup-python@v6.2.0
+        with:
+          python-version: '3.13'
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@v3.3.1
+        env:
+          # Smaller set of platforms that we only provide Stable ABI wheels for
+          CIBW_BUILD: |
+            ${{
+                matrix.os == 'ubuntu-24.04-arm' && '*armv7l *musllinux_aarch64' ||
+                matrix.os == 'ubuntu-latest' && '*linux_i686 *musllinux_x86_64' ||
+                matrix.os == 'windows-latest' && '*win32' ||
+                matrix.os == 'macos-latest' && '*macosx_x86_64' ||
+                matrix.os == 'windows-11-arm' && '*win_arm64' ||
+            '' }}
+
+      - name: Check wheel
+        run: |
+          python -m pip install twine
+          python -m twine check ./wheelhouse/*.whl
+
+      - uses: actions/upload-artifact@v6.0.0
+        with:
+          name: Stable-ABI-${{ matrix.os }}-${{ strategy.job-index }}
+          path: ./wheelhouse/*.whl
+
   upload_release_assets:
     name: Upload Release Wheels
-    needs: [ sdist, build_wheels, Linux ]
+    needs: [ sdist, build_wheels, build_limited_api_wheels, manylinux2014 ]
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tags')
 
@@ -182,8 +232,7 @@ jobs:
             ./bdist_downloads/*.whl
             ./bdist_downloads/*.tar.gz
 
-  Linux:
-
+  manylinux2014:
     strategy:
       # Allows for matrix sub-jobs to fail without canceling the rest
       fail-fast: false
@@ -194,7 +243,7 @@ jobs:
           - manylinux2014_i686
         pyversion: ["*"]
 
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v5