[style] missing header

env-manager/src/main/java/io/yupiik/dev/shared/MessageHelper.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright (c) 2020 - 2023 - Yupiik SAS - https://www.yupiik.com
+ * 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.yupiik.dev.shared;
 
 import io.yupiik.dev.provider.model.Candidate;