[WIP]add workflow_dispatch for testing

Author: mjcheetham

.github/workflows/build-git-installers.yml

@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - 'v[0-9]*vfs*' # matches "v<number><any characters>vfs<any characters>"
+  workflow_dispatch:
 
 permissions:
   id-token: write # required for Azure login via OIDC