update .gitlab-ci.yml

.gitlab-ci.yml

 image: maven:3-jdk-8
 
+before_script:
+    - apt-get update
+
 cache:
   paths:
     - .m2/repository
 
 build:
-  script: mvn -Dmaven.repo.local=.m2/repository --show-version clean verify
+  script: 
+    - mvn -Dmaven.repo.local=.m2/repository --show-version clean verify
   
 after_script:
- - mvn -Dmaven.repo.local=.m2/repository package sonar:sonar -Dsonar.host.url="http://aurora2.private.list.lu:9000"
- - mvn license:add-third-party
- - cat target/generated-sources/license/THIRD-PARTY.txt | grep GNU
+    ##### sonar
+    - mvn -Dmaven.repo.local=.m2/repository package sonar:sonar -Dsonar.host.url="http://aurora2.private.list.lu:9000"
+    ##### licences
+    - apt-get install ruby -y    
+    - gem install license_finder
+    - license_finder
\ No newline at end of file