[Java] Trigger a build if a push to master occurs or when a PR for master branch is created

Author: vyazelenko

.github/workflows/ci.yml

@@ -1,5 +1,11 @@
 name: Continuous Integration
-on: [push, pull_request]
+on:
+ push:
+ branches:
+ - master
+ pull_request:
+ branches:
+ - master
 
 env:
  GRADLE_OPTS: "-Dorg.gradle.daemon=false"