Only perform sonar analysis in base repo

Author: nightm4re94

.github/workflows/build.yml

@@ -59,7 +59,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-        if: github.event.repository.fork == false
+        if: github.repository == 'gurkenlabs/litiengine'
         run: ./gradlew sonar -PskipSpotless
 
       - name: Code Style Validation