fix: add missing header (#3051)

Signed-off-by: Attila Mészáros <[email protected]>

Author: csviri

operator-framework-core/src/test/resources/io/javaoperatorsdk/operator/processing/dependent/kubernetes/statefulset-with-managed-fields-missing.yaml

@@ -1,3 +1,19 @@
+#
+# Copyright Java Operator SDK Authors
+#
+# 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.
+#
+
 apiVersion: apps/v1
 kind: StatefulSet
 metadata: