CacheProduceIT.shouldRejectMessageValues nondeterministic failure in git actions fix (#845)

Author: ankitk-me

runtime/binding-kafka/src/main/java/io/aklivity/zilla/runtime/binding/kafka/internal/stream/KafkaCacheServerProduceFactory.java

@@ -1204,6 +1204,13 @@ private void doProduceInitialData(
                         final int deferred = remaining - length;
                         assert deferred >= 0 : String.format("%d >= 0", deferred);
 
+                        if (messageOffset == 0 &&
+                            length == 0 &&
+                            deferred > 0)
+                        {
+                            break produce;
+                        }
+
                         int flags = 0x00;
                         if (messageOffset == 0)
                         {