Add test PyPI publishing workflow

.github/workflows/pypi_publish.yml

@@ -0,0 +1,36 @@
+name: PyPi Release
+
+# https://help.github.com/en/actions/reference/events-that-trigger-workflows
+on:
+  # Only trigger on release creation
+  release:
+    types:
+      - created
+
+# based on https://github.com/pypa/gh-action-pypi-publish
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      with:
+        python-version: 3.9
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools wheel
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Build
+      run: >-
+        python setup.py sdist bdist_wheel
+    # We do this, since failures on test.pypi aren't that bad
+    - name: Publish to Test PyPI
+      if: startsWith(github.event.ref, 'refs/tags') || github.event_name == 'release'
+      uses: pypa/gh-action-pypi-publish@v1
+      with:
+        user: __token__
+        password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+        repository_url: https://test.pypi.org/legacy/