Move copyright header handling explicitly into the repo

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

.eslintrc.js

@@ -1,4 +1,32 @@
+/*
+ * Copyright 2021 Spotify AB
+ *
+ * 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.
+ */
+
+var path = require('path');
+
 module.exports = {
   root: true,
-  extends: ['@spotify/eslint-config-oss'],
+  plugins: ['notice'],
+  rules: {
+    'notice/notice': [
+      'error',
+      {
+        // eslint-disable-next-line no-restricted-syntax
+        templateFile: path.resolve(__dirname, './scripts/copyright-header.txt'),
+        onNonMatchingHeader: 'replace',
+      },
+    ],
+  },
 };