Automate pushing package to pypi (#349)

After tagging a release, this will automatically push the package the pypi
as well as create the github release attaching the same sdist package to

.github/workflows/tensorflow.yml

@@ -1,10 +1,13 @@
 name: tensorflow
 
 on:
+  workflow_dispatch:
   push:
-    branches: [main]
+    branches: [ main ]
+    tags:
+      - v*
   pull_request:
-    branches: [main]
+    branches: [ main ]
 
 jobs:
   tests:
@@ -39,6 +42,14 @@ jobs:
       - name: Run unittests
         run: |
           make tests-tf
+      - name: Generate package for pypi
+        run: |
+          python setup.py sdist
+      - name: Upload artifacts to github
+        uses: actions/upload-artifact@v2
+        with:
+          name: dist
+          path: dist
       # Build the documentation, TODO: SPHINXOPTS="-W -q" 
       - name: Make HTML
         run: |
@@ -61,3 +72,28 @@ jobs:
         with:
           name: pr
           path: pr/
+
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    if: "startsWith(github.ref, 'refs/tags/')"
+    needs: [tests]
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: dist
+      - name: Create GitHub Release
+        uses: fnkr/[email protected]
+        env:
+          GHR_PATH: .
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Push to PyPi
+        env:
+          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+        run: |
+          pip install --upgrade wheel pip setuptools twine
+          twine upload *