Add release workflow (#103)

.github/workflows/release.yml

@@ -0,0 +1,26 @@
+name: Release to PyPI
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-and-pubish:
+    name: Build and Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.release.tag_name }}
+      - name: Install Python
+        uses: actions/setup-python@v2
+      - name: Install build dependencies
+        run: python -m pip install -U setuptools build wheel
+      - name: Build distributions
+        run: python -m build
+      - name: Publish
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}