CI: Integrate workflow_triggers for kotlin-multiplatform-samples from cartland's fork (#59)

* Update Fruitties.yaml with workflow_dispatch and PR main branch

* Remove branch filter from pull_request trigger

Author: cartland

.github/workflows/Fruitties.yaml

@@ -1,6 +1,7 @@
 name: Build Fruitties sample
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main