git tags are already tested before deploy, exclude from test job

.gitlab-ci.yml

@@ -9,6 +9,7 @@ run tests in branches:
     - MAVEN_OPTS="${MAVEN_OPTS} -Dorg.slf4j.simpleLogger.defaultLogLevel=warn" mvn test -B
   except:
     - master
+    - tags
 
 publish artifacts:
   stage:  deploy