Try longer timeout.

tdt4140-gr1800/app.ui/src/test/java/tdt4140/gr1800/app/ui/GitlabCISupport.java

@@ -11,6 +11,6 @@ public class GitlabCISupport {
         System.setProperty("monocle.platform", "Headless");
         System.setProperty("prism.order", "sw");
         System.setProperty("prism.text", "t2k");
-        System.setProperty("testfx.setup.timeout", "2500");
+        System.setProperty("testfx.setup.timeout", "5000");
     }
 }