MAINT Only trigger wheels building manually or on releases (#74)

Author: rth

.github/workflows/build-wheels.yml

@@ -1,6 +1,17 @@
 name: build_wheels
 
-on: [push, pull_request]
+on:
+  # push
+  # pull_request
+  release:
+    types:
+      - created
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Manually trigger wheel build in Github UI'
+        required: true
+
 
 jobs:
   build_wheels: