Add main function for tests.

src/automation/service/__main__.py

+# Copyright 2022-2024 ETSI OSG/SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
+#
+# 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.
+
+
+def main():
+    global LOGGER # pylint: disable=global-statement
+
+    LOGGER.info('Starting Tests...')
+
+    LOGGER.info('Bye')
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main())