Use native runners for Linux wheel builds per cibuildwheel recommendation

Following cibuildwheel best practices, configure each Linux runner to
build only its native architecture instead of cross-compiling via QEMU:
- ubuntu-latest builds x86_64 wheels natively
- ubuntu-24.04-arm builds aarch64 wheels natively

This eliminates slow QEMU emulation (which was causing multi-hour build
times) and follows the recommended pattern from cibuildwheel docs.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: asmeurer

.github/workflows/publish-package.yml

@@ -73,8 +73,20 @@ jobs:
     needs: [build_sdist]
     strategy:
       matrix:
-        # macos-15-intel is an intel runner, macos-14 is apple silicon
-        os: [ubuntu-latest, ubuntu-24.04-arm, windows-latest, macos-15-intel, macos-14]
+        include:
+          # Build native x86_64 wheels on x86_64 runner
+          - os: ubuntu-latest
+            cibw_archs: "x86_64"
+          # Build native aarch64 wheels on ARM64 runner
+          - os: ubuntu-24.04-arm
+            cibw_archs: "aarch64"
+          - os: windows-latest
+            cibw_archs: "auto"
+          # macos-15-intel is an intel runner, macos-14 is apple silicon
+          - os: macos-15-intel
+            cibw_archs: "auto"
+          - os: macos-14
+            cibw_archs: "auto"
 
     steps:
       - uses: actions/checkout@v5
@@ -94,6 +106,7 @@ jobs:
           package-dir: ${{ env.SDIST_FILE }}
           output-dir: dist/
         env:
+          CIBW_ARCHS_LINUX: ${{ matrix.cibw_archs }}
           CIBW_TEST_COMMAND: >
               python -c "import ndindex; assert '1.' in ndindex.__version__"
 

pyproject.toml

@@ -11,8 +11,5 @@ build-backend = "setuptools.build_meta"
 enable = ["cpython-freethreading"]
 skip = "*t*_i686"
 
-[tool.cibuildwheel.linux]
-archs = ["x86_64", "aarch64"]
-
 [tool.cibuildwheel.macos]
 environment = { CXXFLAGS="-std=c++11" }