Trigger Windows build on pushes to feature/portable_build

workflow_dispatch only appears in the GitHub UI once the workflow is on
the default branch. Adding a branch push trigger lets the build run while
the workflow is still on the feature branch.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: melevittfl

.github/workflows/build-windows.yml

@@ -2,6 +2,8 @@ name: Build Windows Binary
 
 on:
   push:
+    branches:
+      - feature/portable_build
     tags:
       - 'v*'
   workflow_dispatch: