Update build.yml

Author: smlu

.github/workflows/build.yml

@@ -5,7 +5,8 @@ on:
     branches: [ "master", "develop" ]
   pull_request:
     branches: [ "master", "develop" ]
-
+  workflow_dispatch:
+  
 env:
   # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
   BUILD_TYPE: Release