Fix append in builder.go

builder/azure/arm/builder.go

@@ -158,7 +158,8 @@ func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (pack
 		}
 		if foundMandatoryReplicationRegion == false {
 			// return nil, fmt.Errorf("SIG requires that replication regions %v include the region %s in which the Managed Image resides", b.config.SharedGalleryDestination.SigDestinationReplicationRegions, b.config.manageImageLocation)
-			b.stateBag.Put(constants.ArmManagedImageSharedGalleryReplicationRegions, append(b.config.SharedGalleryDestination.SigDestinationReplicationRegions, b.config.manageImageLocation))
+			b.config.SharedGalleryDestination.SigDestinationReplicationRegions = append(b.config.SharedGalleryDestination.SigDestinationReplicationRegions, b.config.manageImageLocation)
+			b.stateBag.Put(constants.ArmManagedImageSharedGalleryReplicationRegions, b.config.SharedGalleryDestination.SigDestinationReplicationRegions)
 			ui.Say(fmt.Sprintf("Adding Managed Image region SIG replications regions %v", b.config.SharedGalleryDestination.SigDestinationReplicationRegions))
 		}
 	}