Update sonar_preview.sh

ci/sonar_preview.sh

@@ -7,7 +7,8 @@ mvn --batch-mode verify sonar:sonar \
     -Dsonar.analysis.mode=preview \
     -Dsonar.gitlab.project_id=$CI_PROJECT_ID \
     -Dsonar.gitlab.commit_sha=$CI_COMMIT_SHA \
-    -Dsonar.gitlab.ref_name=$CI_COMMIT_REF_NAME
+    -Dsonar.gitlab.ref_name=$CI_COMMIT_REF_NAME \
+    clean install
 
 if [ $? -eq 0 ]; then
     echo "sonarqube code-analyze-preview over."