Update release to only run on tags.

Author: douglasthomsen

.github/workflows/release.yml

@@ -1,8 +1,9 @@
 name: Release
 on:
   push:
-    branches: [main]
-    tags: ["*"]
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+  workflow_dispatch:
 jobs:
   publish:
     runs-on: ubuntu-20.04