Build distributions on GitHub actions.

.github/workflows/wheels.yml

@@ -0,0 +1,71 @@
+name: Build wheels
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - '*'
+
+jobs:
+  sdist:
+    name: Build source distribution
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v2
+    - name: Install Python 3.x
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.x
+    - name: Build sdist
+      run: python setup.py sdist
+    - name: Save sdist
+      uses: actions/upload-artifact@v2
+      with:
+        path: dist/*.tar.gz
+
+  wheels:
+    name: Build wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, windows-2019, macOS-10.15]
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v2
+    - name: Make extension build mandatory
+      run: touch .cibuildwheel
+    - name: Install Python 3.x
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.x
+    - name: Set up QEMU
+      if: runner.os == 'Linux'
+      uses: docker/setup-qemu-action@v1
+      with:
+        platforms: all
+    - name: Build wheels
+      uses: joerick/cibuildwheel@v1.11.0
+      env:
+        CIBW_ARCHS_LINUX: auto aarch64
+        CIBW_BUILD: cp36-* cp37-* cp38-* cp39-*
+    - name: Save wheels
+      uses: actions/upload-artifact@v2
+      with:
+        path: wheelhouse/*.whl
+
+  upload_pypi:
+    name: Upload to PyPI
+    needs: [sdist, wheels]
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: artifact
+          path: dist
+      - uses: pypa/gh-action-pypi-publish@master
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}