Also build manylinux wheels for aarch64

.github/workflows/build_wheels.yml

@@ -23,6 +23,13 @@ jobs:
       - name: Install cibuildwheel
         run: python -m pip install cibuildwheel==1.10.0
 
+      # Needed for Linux aarch64 builds
+      - name: Set up QEMU
+        if: runner.os == 'Linux'
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+
       - name: Build wheels
         run: python -m cibuildwheel --output-dir wheelhouse
         env:
@@ -31,8 +38,10 @@ jobs:
           # Build wheels for Apple Silicon
           CIBW_ARCHS_MACOS: "x86_64 universal2 arm64"
           # Build manylinux2014 wheels
+          CIBW_ARCHS_LINUX: auto aarch64
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
           CIBW_MANYLINUX_I686_IMAGE: manylinux2014
+          CIBW_MANYLINUX_AARCH64_IMAGE: manylinux2014
           # The C libraries (OpenSSL and Zlib) only need to be built once per OS
           # as they are not tied to a specific Python version
           CIBW_BEFORE_ALL: "python -m pip install invoke && invoke build.deps"