Add github action to release project to pypi on tag

Author: autophagy

.github/workflows/release.yml

@@ -0,0 +1,29 @@
+---
+name: release
+
+on: push
+
+jobs:
+  pypi:
+    name: Build & publish package to pypi
+    runs-on: ubuntu-latest
+    if: startsWith(github.event.ref, 'refs/tags')
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Set up python 3.8
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+
+      - name: Build package
+        run: |
+          python -m pip install twine wheel
+          python setup.py sdist bdist_wheel
+          twine check dist/*.tar.gz
+
+      - name: Publish package
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.pypi_password }}

DEVELOP.rst

@@ -59,48 +59,17 @@ In the release branch:
 
 - Push to origin/<release_branch>
 
-- Create a tag by running ``./devtools/create_tag.sh``
+- Create a tag by running ``./devtools/create_tag.sh``. This will trigger a
+  Github action which releases the new version to PyPi.
 
 On master:
 
 - Update the release notes to reflect the release
 
 Next:
 
-- Deploy to PyPI (see section below)
-
 - Archive docs for old releases (see section below)
 
-PyPI Deployment
----------------
-
-To create the package use::
-
-    $ bin/py setup.py sdist bdist_wheel
-
-Then, use twine_ to upload the package to PyPI_::
-
-    $ bin/twine upload dist/*
-
-For this to work, you will need a personal PyPI account that is set up as a project admin.
-
-You'll also need to create a ``~/.pypirc`` file, like so::
-
-    [distutils]
-    index-servers =
-      pypi
-
-    [pypi]
-    repository=https://pypi.python.org/pypi
-    username=<USERNAME>
-    password=<PASSWORD>
-
-Here, ``<USERNAME>`` and ``<PASSWORD>`` should be replaced with your username and password, respectively.
-
-If you want to check the PyPI description before uploading, run::
-
-    $ bin/py setup.py check --strict --restructuredtext
-
 Archiving Docs Versions
 -----------------------