Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -12,5 +12,5 @@ Build:       # This job runs in the build stage, which runs first.
   stage: build
   script:
     - echo "Compiling the code..."     
-    - mvn clean compile javafx:run
+    - mvn $MAVEN_CLI_OPTS compile
     - echo "Compile complete."