Publish Python packages on pypi on every git tag (#761)

* Publish Python wheels on pypi on every git tag

* Remove config required for testing

* Pin workflow version & remove duplicate dependency

.github/workflows/main.yml

@@ -493,6 +493,24 @@ jobs:
         name: tarballs
         path: dist
 
+    # The action 'pypa/gh-action-pypi-publish' will try to upload all files in the
+    # dist/ folder. This folder also contains non-package files, and therefore the
+    # action fails.
+    #
+    # To prevent the action from failing all .whl files are copied into a new
+    # directory.
+    - run: |
+        mkdir -p tmp/whl
+        find dist/ -name '*.whl' -type f -exec cp '{}' tmp/whl -v \;
+
+    - name: Publish Python wheels on Pypi
+      uses: pypa/gh-action-pypi-publish@v1.0.0a0
+      if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
+      with:
+        user: __token__
+        password: ${{ secrets.pypi_password }}
+        packages_dir: tmp/whl
+
     # ... and if this was an actual push (tag or `master`) then we publish a
     # new release. This'll automatically publish a tag release or update `dev`
     # with this `sha`
@@ -503,3 +521,4 @@ jobs:
         files: "dist/*"
         name: ${{ steps.tagname.outputs.val }}
         token: ${{ secrets.GITHUB_TOKEN }}
+