feat(ci): build wheels for aarch64

As github runners can be used with qemu we simply emulate the aarch64
cpu needed to build for it. This allows faster installations on tradionally
weaker embedded hardware.

Signed-off-by: Mimoja <git@mimoja.de>

.github/workflows/ci.yml

@@ -104,18 +104,27 @@ jobs:
   build_wheels:
     needs: [release]
 
-    name: Build wheels on ${{ matrix.os }}
+    name: Build wheels on ${{ matrix.os }} with arch ${{ matrix.arch }}
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-20.04]
+        arch:
+          - "x86_64"
+          - "aarch64"
 
     steps:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 0
           ref: "main"
 
+      - name: Set up QEMU
+        if: matrix.arch == 'aarch64'
+        uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
+        with:
+          platforms: arm64
+
       # Used to host cibuildwheel
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -145,6 +154,7 @@ jobs:
           CIBW_BEFORE_ALL_LINUX: apt-get install -y gcc || yum install -y gcc || apk add gcc
           CIBW_BUILD_VERBOSITY: 3
           REQUIRE_CYTHON: 1
+          CIBW_ARCHS: ${{ matrix.arch }}
 
       - uses: actions/upload-artifact@v3
         with: