CI: Add workflow for publishing to PyPI

This works only when a new release is published.

.github/workflows/release.yml

@@ -0,0 +1,37 @@
+name: Make Release
+
+on:
+  release:
+    types:
+      - published
+
+jobs:
+  packages:
+    name: Release Packages
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 150
+
+    - name: Get tags
+      run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+
+    - name: Install build tools
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install --upgrade setuptools setuptools_scm wheel
+
+    - name: Build packages
+      run: python setup.py sdist bdist_wheel
+
+    - name: Publish Package
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        user: __token__
+        password: ${{ secrets.pypi_token }}