Update ant.yml

.github/workflows/ant.yml

@@ -1,21 +1,21 @@
 # This workflow will build a Java project with Ant
 # For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-ant
 
-name: SWG DSRC CI
+name: Build Java
 
 on:
   push:
     branches: [ master ]
+    paths:
+      - '*.java'
   pull_request:
     branches: [ master ]
+    paths:
+      - '*.java'
 
 jobs:
   build:      
-    runs-on: ubuntu-latest
-    
-    rules:
-      - exists:
-        - sku.0/*.java
+    runs-on: ubuntu-latest    
           
     steps:          
       - uses: actions/checkout@v2