Add aarch64 wheel building.

.github/workflows/pythonpublish.yml

@@ -41,6 +41,14 @@ jobs:
       run: |
         python setup.py sdist bdist_wheel
       if: "matrix.os != 'ubuntu-latest'"
+    - uses: docker/setup-qemu-action@v1
+      name: Set up QEMU
+      if: "matrix.os == 'ubuntu-latest'"
+    - name: Build and publish (Linux aarch64)
+      uses: RalfG/python-wheels-manylinux-build@v0.3.3-manylinux2014_aarch64
+      with:
+        python-versions: 'cp36-cp36m cp37-cp37m cp38-cp38 cp39-cp39'
+      if: "matrix.os == 'ubuntu-latest'"
     - name: Build and publish (Linux)
       uses: RalfG/python-wheels-manylinux-build@v0.3.1
       with: