bugfix: add missing @bean to polyflow connector starter

digiwf-task/digiwf-polyflow-connector-starter/src/main/java/de/muenchen/oss/digiwf/task/PolyflowConnectorAutoConfiguration.java

@@ -8,6 +8,11 @@
 import io.holunda.polyflow.taskpool.sender.SenderConfiguration;
 import jakarta.annotation.PostConstruct;
 import lombok.extern.slf4j.Slf4j;
+import org.axonframework.common.jpa.EntityManagerProvider;
+import org.axonframework.common.transaction.TransactionManager;
+import org.axonframework.eventsourcing.eventstore.EventStorageEngine;
+import org.axonframework.eventsourcing.eventstore.jpa.JpaEventStorageEngine;
+import org.axonframework.serialization.Serializer;
 import org.axonframework.springboot.autoconfig.AxonAutoConfiguration;
 import org.axonframework.springboot.autoconfig.ObjectMapperAutoConfiguration;
 import org.springframework.beans.factory.annotation.Qualifier;
@@ -16,7 +21,6 @@
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.Import;
 
 // Client integration components
 
@@ -73,4 +77,19 @@
     public TaskManagementProperties.AssignmentProperties assignmentProperties(TaskManagementProperties properties) {
         return properties.getAssignment();
     }
+
+    @Bean
+    public EventStorageEngine jpaStorageEngine(
+            EntityManagerProvider entityManagerProvider,
+            TransactionManager transactionManager,
+            @Qualifier("eventSerializer")
+            Serializer eventSerializer
+    ) {
+        return JpaEventStorageEngine
+                .builder()
+                .entityManagerProvider(entityManagerProvider)
+                .transactionManager(transactionManager)
+                .eventSerializer(eventSerializer)
+                .build();
+    }
 }