Add Python package build for multiple Python versions (Linux only)

.github/workflows/build.yml

@@ -19,4 +19,28 @@ jobs:
         sudo apt-get install python3 python3-pip
         pip install pybind11
     - name: Build Python
-      run: ./build_and_test_python_library.sh
+      run: ./build_and_test_python_library.sh
+  build_binary_packages:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Display Python version
+      run: python -c "import sys; print(sys.version)"
+    - name: Install build dependencies
+      run: |
+        sudo apt-get install python3 python3-pip
+        pip install pybind11
+    - name: Build Python
+      run: ./build_and_test_python_library.sh
+    - uses: actions/upload-artifact@v2
+      with:
+        name: wheel-${{ matrix.python-version }}
+        path: |
+            dist/IsoOctree*.whl