[to-test] Trigger image promotion again

It should be saner after [1].

[1] https://review.opendev.org/c/nebulous/project-config/+/889405

Change-Id: I7c26d3f4957f618f19121d8e226de69c8018eb5f

java-spring-boot-demo/src/main/java/com/example/demo/DemoController.java

@@ -8,7 +8,7 @@ public class DemoController {
 
     @RequestMapping("/")
     public String root() {
-        return "";
+        return "t";
     }
 
 }