Output files are named as the templates with the ending stripped.

endpoints-templates/Codecs.scala.ftl

@@ -0,0 +1,19 @@
+// Copyright 2025 "Johan Maasing" <johan@zoom.nu>
+//
+//   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 ${config.package}
+
+object Codecs:
+<#list typeDefinitions as type>
+    given Codec[${type.name?cap_first}] = deriveCodec
+</#list>