Add github workflow for TestPyPI publishing.

.github/workflows/python-publish-test.yml

@@ -0,0 +1,52 @@
+# This workflows will upload a Python Package using Twine when a release is created
+# For more information see: https://help.github.com/en/actions/language-and-framework-guides/using-python-with-github-actions#publishing-to-package-registries
+
+name: Upload Python Package
+
+on:
+  release:
+    types: [created]
+
+  workflow_dispatch:
+
+jobs:
+  deploy:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+
+    permissions:
+       # IMPORTANT: this permission is mandatory for trusted publishing
+      id-token: write
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.12'
+    - name: Set up .NET
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: '6.0.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install setuptools build wheel twine
+    - name: Build
+      run: |
+        python -m build --wheel
+
+    # Doesn't run on Windows ☹️
+    # - name: Publish package distributions to PyPI
+    # uses: pypa/gh-action-pypi-publish@release/v1
+
+    - name: Publish
+      env:
+        TWINE_USERNAME: '__token__'
+        TWINE_PASSWORD: ${{ secrets.TESTPYPI_PASSWORD }}
+      run: |
+        twine upload --repository testpypi dist/*.whl
+