github workflows : check licensing of *.j2 files

[giem-git]

Jinja template files (*.j2) should have a copyright header as follows :

{#                               
# Copyright 2022 TOSIT.IO
# SPDX-License-Identifier: Apache-2.0
#}  

For most j2 files this header should simply be added and it will not change the final file content.

Some template files are derived from original configuration files and already have an Apache Software Foundation license block :

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.

How should we handle these files ?