Limit to released event types

Author: akarnokd

Diff for: .github/workflows/gradle_release.yml

@@ -5,9 +5,10 @@ name: Release
 
 on:
   release:
+    types: [ released ]
     branches: [ '3.x' ]
     tags:
-      - 'v3.*.*'
+      - 'v3.*.*'   
 
 jobs:
   build:
@@ -46,4 +47,4 @@ jobs:
     - name: Upload to Codecov  
       uses: codecov/codecov-action@v1
     - name: Push Javadocs
-      run: ./push_javadoc.sh
+      run: ./push_javadoc.sh