[UNDERTOW-2256] Add missing header.

Signed-off-by: Flavia Rainone <[email protected]>

core/src/test/java/io/undertow/server/handlers/file/FileHandlerWithPredicateTestCase.java

@@ -1,3 +1,20 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2024 Red Hat, Inc., and individual contributors
+ * as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
 package io.undertow.server.handlers.file;
 
 import io.undertow.predicate.PredicatesHandler;