Fix for reset tag used with extends

[mammo0]

Hello,

I have a docker-compose.yaml file that uses the extends attributes and resets the ports of the extended file:

services:
  test:
    extends:
      file: parent-compose.yaml
      service: extended_service
    ports: !reset []

Unfortunately this results in the following error:

Traceback (most recent call last):
  File "***/podman-compose/podman_compose.py", line 4520, in <module>
    main()
    ~~~~^^
  File "***/podman-compose/podman_compose.py", line 4516, in main
    asyncio.run(async_main())
    ~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "***/podman-compose/podman_compose.py", line 4512, in async_main
    await podman_compose.run()
  File "***/podman-compose/podman_compose.py", line 2135, in run
    self._parse_compose_file()
    ~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "***/podman-compose/podman_compose.py", line 2409, in _parse_compose_file
    self.merged_yaml = yaml.safe_dump(compose)
                       ~~~~~~~~~~~~~~^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/yaml/__init__.py", line 269, in safe_dump
    return dump_all([data], stream, Dumper=SafeDumper, **kwds)
  File "/usr/lib/python3.13/site-packages/yaml/__init__.py", line 241, in dump_all
    dumper.represent(data)
    ~~~~~~~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 27, in represent
    node = self.represent_data(data)
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 48, in represent_data
    node = self.yaml_representers[data_types[0]](self, data)
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 207, in represent_dict
    return self.represent_mapping('tag:yaml.org,2002:map', data)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 118, in represent_mapping
    node_value = self.represent_data(item_value)
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 48, in represent_data
    node = self.yaml_representers[data_types[0]](self, data)
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 207, in represent_dict
    return self.represent_mapping('tag:yaml.org,2002:map', data)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 118, in represent_mapping
    node_value = self.represent_data(item_value)
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 48, in represent_data
    node = self.yaml_representers[data_types[0]](self, data)
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 207, in represent_dict
    return self.represent_mapping('tag:yaml.org,2002:map', data)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 118, in represent_mapping
    node_value = self.represent_data(item_value)
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 58, in represent_data
    node = self.yaml_representers[None](self, data)
  File "/usr/lib/python3.13/site-packages/yaml/representer.py", line 231, in represent_undefined
    raise RepresenterError("cannot represent an object", data)
yaml.representer.RepresenterError: ('cannot represent an object', <__main__.ResetTag object at 0x7fce2419c980>)

I fixed this problem by setting the dumper for the OverrideTag and ResetTag classes to yaml.SafeDumper. Otherwise these classes wont be used by the safe_dump method that is used by podman-compose.

Additionally those custom tag classes caused some further problems, when the compose dictionary is converted to a JSON string using json.dumps(). Therefore I extended the original_service method to cover also nested dictionaries.