Issue with testing ryuk under dind

[Tranquility2]

We seem to have an issue that is not easy to reproduce with ryuk under dind.
the issue started to appear after I upgraded to Docker 29.3.0

 Engine:
  Version:          29.3.0
  API version:      1.54 (minimum version 1.40)
  Go version:       go1.25.7
  Git commit:       83bca51
  Built:            Thu Mar  5 14:25:48 2026
  OS/Arch:          linux/amd64
  Experimental:     false

Example from the tests:

=================================== FAILURES ===================================
_____________________________ test_wait_for_reaper _____________________________
core/tests/test_ryuk.py:46: in test_wait_for_reaper
    with pytest.raises(NotFound):
E   Failed: DID NOT RAISE <class 'docker.errors.NotFound'>
------------------------------ Captured log call -------------------------------
INFO     testcontainers.core.container:container.py:178 Pulling image testcontainers/ryuk:0.8.1
INFO     testcontainers.core.container:container.py:207 Container started: 11c29242a3a6
INFO     testcontainers.core.container:container.py:178 Pulling image hello-world
INFO     testcontainers.core.container:container.py:207 Container started: 0faee54fa35a
_________________________ test_container_without_ryuk __________________________
.venv/lib/python3.10/site-packages/docker/api/client.py:275: in _raise_for_status
    response.raise_for_status()
.venv/lib/python3.10/site-packages/requests/models.py:1026: in raise_for_status
    raise HTTPError(http_error_msg, response=self)
E   requests.exceptions.HTTPError: 409 Client Error: Conflict for url: http+docker://localhost/v1.54/containers/11c29242a3a66f2fc35fe87d8ccdf169c05af8b3a946bb823b7aa295b9bde314?v=True&link=False&force=True

The above exception was the direct cause of the following exception:
core/tests/test_ryuk.py:58: in test_container_without_ryuk
    Reaper.delete_instance()
core/testcontainers/core/container.py:333: in delete_instance
    Reaper._container.stop()
core/testcontainers/core/container.py:212: in stop
    self._container.remove(force=force, v=delete_volume)
.venv/lib/python3.10/site-packages/docker/models/containers.py:367: in remove
    return self.client.api.remove_container(self.id, **kwargs)
.venv/lib/python3.10/site-packages/docker/utils/decorators.py:19: in wrapped
    return f(self, resource_id, *args, **kwargs)
.venv/lib/python3.10/site-packages/docker/api/container.py:1037: in remove_container
    self._raise_for_status(res)
.venv/lib/python3.10/site-packages/docker/api/client.py:277: in _raise_for_status
    raise create_api_error_from_http_exception(e) from e
.venv/lib/python3.10/site-packages/docker/errors.py:39: in create_api_error_from_http_exception
    raise cls(e, response=response, explanation=explanation) from e
E   docker.errors.APIError: 409 Client Error for http+docker://localhost/v1.54/containers/11c29242a3a66f2fc35fe87d8ccdf169c05af8b3a946bb823b7aa295b9bde314?v=True&link=False&force=True: Conflict ("removal of container 11c29242a3a66f2fc35fe87d8ccdf169c05af8b3a946bb823b7aa295b9bde314 is already in progress")
=============================== warnings summary ===============================
core/testcontainers/core/config.py:89
  /workspace/core/testcontainers/core/config.py:89: PytestCollectionWarning: cannot collect test class 'TestcontainersConfiguration' because it has a __init__ constructor (from: core/tests/test_config.py)
    @dataclass

.venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:275
  /workspace/.venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:275: FutureWarning: You are using a Python version (3.10.19) which Google will stop supporting in new releases of google.api_core once it reaches its end of life (2026-10-04). Please upgrade to the latest Python version, or at least Python 3.11, to continue receiving updates for google.api_core past that date.
    warnings.warn(message, FutureWarning)

.venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:275
  /workspace/.venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:275: FutureWarning: You are using a Python version (3.10.19) which Google will stop supporting in new releases of google.cloud.datastore_v1 once it reaches its end of life (2026-10-04). Please upgrade to the latest Python version, or at least Python 3.11, to continue receiving updates for google.cloud.datastore_v1 past that date.
    warnings.warn(message, FutureWarning)

.venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:275
  /workspace/.venv/lib/python3.10/site-packages/google/api_core/_python_version_support.py:275: FutureWarning: You are using a Python version (3.10.19) which Google will stop supporting in new releases of google.pubsub_v1 once it reaches its end of life (2026-10-04). Please upgrade to the latest Python version, or at least Python 3.11, to continue receiving updates for google.pubsub_v1 past that date.
    warnings.warn(message, FutureWarning)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
=========================== short test summary info ============================
FAILED core/tests/test_ryuk.py::test_wait_for_reaper - Failed: DID NOT RAISE ...
FAILED core/tests/test_ryuk.py::test_container_without_ryuk - docker.errors.A...
===== 2 failed, 3 passed, 469 deselected, 1 xfailed, 4 warnings in 55.64s ======

Its seems like in past cases a timing issue with the containers cleanup.

[Tranquility2]

I'm going to try and address this in an upcoming PR