Fix omission to run unit tests when Sonar not installed

Author: goneall

.github/workflows/build.yml

@@ -42,4 +42,6 @@ jobs:
       run: |
         if [[ $SONAR_TOKEN != "" ]]; then
            mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent install sonar:sonar
+        else
+           mvn --batch-mode --update-snapshots verify
         fi