Add PyPI build/publish workflow.

.github/workflows/pypi.yml

@@ -1,11 +1,20 @@
 ---
 name: Publish Python 🐍 distribution 📦 to TestPyPI
 
-on: push
+# We want to trigger on push (to deploy to TestPyPI) and on releases (to deploy to PyPI)
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'  # Push events to matching v*
+  release:
+    types:
+      - created
 
 jobs:
   build:
-    name: Build distribution 📦
+    name: Build 📦
     runs-on: ubuntu-latest
 
     steps:
@@ -28,7 +37,7 @@ jobs:
         path: dist/
 
   publish-to-pypi:
-    name: Publish Python 🐍 distribution 📦 to PyPI
+    name: "PyPI: Publish 🚀"
     if: startsWith(github.ref, 'refs/tags/v')  # only publish to PyPI pushes of tags that start with 'v'
     needs:
     - build
@@ -49,7 +58,7 @@ jobs:
       uses: pypa/gh-action-pypi-publish@release/v1
 
   publish-to-testpypi:
-    name: Publish Python 🐍 distribution 📦 to TestPyPI
+    name: "TestPyPi: Publish 🧪"
     needs:
     - build
     runs-on: ubuntu-latest