Update ci.yml

Author: reda-alaoui

.github/workflows/ci.yml

@@ -1,11 +1,17 @@
 name: CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - '**'
+  pull_request:
+    branches:
+    - '**'
 
 jobs:
   build:
     runs-on: ubuntu-latest
-
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     steps:
       - uses: actions/checkout@v2
       - name: Set up JDK 17