Update python-package.yml

Author: GoodManWEN

.github/workflows/python-package.yml

@@ -5,9 +5,14 @@ name: Build
 
 on:
   push:
-    branches: [ main ]
+    branches:
+      - 'main'
+      - '[0-9].[0-9]+'  # matches to backport branches, e.g. 3.6
+      - dev
   pull_request:
-    branches: [ main ]
+    branches:
+      - 'main'
+      - '[0-9].[0-9]+'
   schedule:
     - cron:  '0 9 1 * *'  # Runs at 09:00 UTC on the 1st of every month