Add Github action for pypi build/publishing (#77)

Adjust action

Author: Mark Beacom

.github/workflows/pypi-publish.yml

@@ -0,0 +1,30 @@
+name: Python package
+
+on:
+  push:
+    branches:
+    - master
+
+jobs:
+  build-deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
+      with:
+        python-version: '3.7'
+        architecture: 'x64'
+    - name: Install dependencies
+      if: success()
+      run: |
+        python -m pip install --upgrade pip
+        pip install pipenv
+        pipenv install --dev --pre --system --deploy
+    - name: Build and publish the pypi package
+      if: success()
+      run: python3 setup.py upload
+      env:
+        TWINE_USER: __token__
+        TWINE_PASS: ${{ secrets.pypi_token }}