Run only on tags

Author: rjfarmer

.github/workflows/pypi.yml

@@ -1,5 +1,9 @@
 name: Publish to pypi
-on: [push]
+on:
+  push:
+    tags:
+      - 'v*'
+
 
 jobs:
   pypi-publish:
@@ -20,7 +24,7 @@ jobs:
       with:
         python-version: '3.x'
 
-    - name: Install dependices
+    - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install build wheel pytest