Add new flowable exception

multiapps-common/src/main/java/org/cloudfoundry/multiapps/common/StepPhaseRetryException.java

@@ -0,0 +1,13 @@
+package org.cloudfoundry.multiapps.common;
+
+/**
+ * A runtime exception that signals Flowable to move the job to dead-letter state without logging anything to the operation log or progress
+ * message database. Used when a step returns StepPhase.RETRY to stop the process cycle cleanly.
+ */
+public class StepPhaseRetryException extends RuntimeException {
+
+    public StepPhaseRetryException(String message) {
+        super(message);
+    }
+
+}