build pull req head branch instead of base branch

Author: FalkWolsky

.github/workflows/sonarcloud.yml

@@ -21,6 +21,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+          ref: ${{ github.event.pull_request.head.sha }}
       - name: Build Java
         run: |
           mvn clean compile -DskipTests -f ./server/api-service/pom.xml