publish java package only when creating a new release or manually

Author: asafc

.github/workflows/publish.yaml

@@ -1,8 +1,9 @@
 name: Publish package to GitHub Packages
 on:
-  push:
-    branches:
-      - master
+  release:
+    types: [created]
+  workflow_dispatch:
+  
 jobs:
   publish:
     runs-on: ubuntu-latest