Introduce onPublish() to satisfy Flow 9 interface

The TargetInterface in Flow 9 was extended by a new method "onPublish()". The GcsTarget class now implements that method in order to satisfy the new interface.

See also: neos/flow-development-collection#3229

Classes/GcsTarget.php

@@ -423,6 +423,16 @@ private function publishCollectionFromDifferentGoogleCloudStorage(CollectionInte
         $this->logger->info(sprintf('Published %s new objects to target bucket "%s".', $iteration, $this->bucketName), LogEnvironment::fromMethodName(__METHOD__));
     }
 
+    /**
+     * Satisfy the TargetInterface
+     *
+     * @param \Closure $callback
+     * @return void
+     */
+    public function onPublish(\Closure $callback): void
+    {
+    }
+
     /**
      * Returns the web accessible URI pointing to the given static resource
      *