Add workflow_dispatch

Author: fdennis

.github/workflows/windows.yml

@@ -1,6 +1,6 @@
 name: Windows
 
-on: [push, pull_request]
+on: workflow_dispatch
 
 jobs:
   build:
@@ -16,7 +16,7 @@ jobs:
         run: |
           python set-version.py
           git diff --exit-code
-          
+
       - name: Set up Python
         uses: actions/setup-python@v5
         with: