Build aarch64 wheel on Linux

Author: ymd-h

.github/workflows/build.yml

@@ -36,8 +36,14 @@ jobs:
           cache-dependency-glob: |
             **/pyproject.toml
             **/setup.py
+      - if: runner.os == 'Linux'
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: all
       - run: uvx -p 3.12 cibuildwheel
         shell: bash
+        env:
+          CIBW_ARCHS_LINUX: auto aarch64
       - uses: actions/upload-artifact@v4
         with:
           name: dist-${{ matrix.runs-on }}-${{ strategy.job-index }}