feat: add armv7l wheels (#59)

Author: bdraco

.github/workflows/ci.yml

@@ -163,54 +163,98 @@ jobs:
   build_wheels:
     needs: [release]
     if: needs.release.outputs.released == 'true'
-
-    name: Build wheels on ${{ matrix.os }}
+    name: Wheels for ${{ matrix.os }} (${{ matrix.musl == 'musllinux' && 'musllinux' || 'manylinux' }}) ${{ matrix.qemu }} ${{ matrix.pyver }}
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os:
-          - ubuntu-24.04-arm
-          - macos-13
-          - macos-latest
-          - ubuntu-latest
-          - windows-latest
-        musl: ["", "musllinux"]
-        exclude:
-          - os: windows-latest
+          [
+            windows-latest,
+            ubuntu-24.04-arm,
+            ubuntu-latest,
+            macos-13,
+            macos-latest,
+          ]
+        qemu: [""]
+        musl: [""]
+        pyver: [""]
+        include:
+          - os: ubuntu-latest
+            musl: "musllinux"
+          - os: ubuntu-24.04-arm
             musl: "musllinux"
-          - os: macos-latest
+          # qemu is slow, make a single
+          # runner per Python version
+          - os: ubuntu-latest
+            qemu: armv7l
             musl: "musllinux"
-          - os: macos-13
+            pyver: cp311
+          - os: ubuntu-latest
+            qemu: armv7l
             musl: "musllinux"
+            pyver: cp312
+          - os: ubuntu-latest
+            qemu: armv7l
+            musl: "musllinux"
+            pyver: cp313
+          # qemu is slow, make a single
+          # runner per Python version
+          - os: ubuntu-latest
+            qemu: armv7l
+            musl: ""
+            pyver: cp311
+          - os: ubuntu-latest
+            qemu: armv7l
+            musl: ""
+            pyver: cp312
+          - os: ubuntu-latest
+            qemu: armv7l
+            musl: ""
+            pyver: cp313
     steps:
       - uses: actions/checkout@v4
         with:
           ref: ${{ needs.release.outputs.newest_release_tag }}
           fetch-depth: 0
-
       # Used to host cibuildwheel
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: "3.11"
-
-      - name: Install cibuildwheel
-        run: python -m pip install cibuildwheel==2.23.0
-
+          python-version: "3.12"
+      - name: Set up QEMU
+        if: ${{ matrix.qemu }}
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: all
+          # This should be temporary
+          # xref https://github.com/docker/setup-qemu-action/issues/188
+          # xref https://github.com/tonistiigi/binfmt/issues/215
+          image: tonistiigi/binfmt:qemu-v8.1.5
+        id: qemu
+      - name: Prepare emulation
+        if: ${{ matrix.qemu }}
+        run: |
+          if [[ -n "${{ matrix.qemu }}" ]]; then
+            # Build emulated architectures only if QEMU is set,
+            # use default "auto" otherwise
+            echo "CIBW_ARCHS_LINUX=${{ matrix.qemu }}" >> $GITHUB_ENV
+          fi
+      - name: Limit to a specific Python version on slow QEMU
+        if: ${{ matrix.pyver }}
+        run: |
+          if [[ -n "${{ matrix.pyver }}" ]]; then
+            echo "CIBW_BUILD=${{ matrix.pyver }}*" >> $GITHUB_ENV
+          fi
       - name: Build wheels
-        run: python -m cibuildwheel --output-dir wheelhouse
-        # to supply options, put them in 'env', like:
+        uses: pypa/[email protected]
         env:
-          CIBW_SKIP: cp36-* cp37-* cp38-* cp39-* cp310-* pp36-* pp37-* pp38-* pp39-* pp310-* ${{ matrix.musl == 'musllinux' && '*manylinux*' || '*musllinux*' }}
-          CIBW_BEFORE_ALL_LINUX: apt-get install -y gcc || yum install -y gcc || apk add gcc
-          CIBW_BUILD_VERBOSITY: 3
+          CIBW_SKIP: cp36-* cp37-* cp38-* cp39-* cp310-* pp* ${{ matrix.musl == 'musllinux' && '*manylinux*' || '*musllinux*' }}
           REQUIRE_CYTHON: 1
-          CIBW_ARCHS_LINUX: ${{ matrix.os == 'ubuntu-24.04-arm' && 'aarch64' || 'auto' }}
 
       - uses: actions/upload-artifact@v4
         with:
+          name: wheels-${{ matrix.os }}-${{ matrix.musl }}-${{ matrix.pyver }}-${{ matrix.qemu }}
           path: ./wheelhouse/*.whl
-          name: wheels-${{ matrix.os }}-${{ matrix.musl }}
 
   upload_pypi:
     needs: [build_wheels]