CI Failure (key symptom) in `TieredStorageTest.test_tiered_storage`

[vbotbuildovich]

https://buildkite.com/redpanda/vtools/builds/11891

Module: rptest.tests.tiered_storage_model_test
Class: TieredStorageTest
Method: test_tiered_storage
Arguments: {
    "test_case": {
        "name": "(TS_Read == True, SegmentRolledByTimeout == True)"
    },
    "cloud_storage_type": 1
}

test_id:    TieredStorageTest.test_tiered_storage
status:     FAIL
run time:   12.069 seconds

NoCredentialsError('Unable to locate credentials')
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/ducktape/tests/runner_client.py", line 182, in _do_run
    self.setup_test()
  File "/usr/local/lib/python3.10/dist-packages/ducktape/tests/runner_client.py", line 260, in setup_test
    self.test.setup()
  File "/usr/local/lib/python3.10/dist-packages/ducktape/tests/test.py", line 91, in setup
    self.setUp()
  File "/home/ubuntu/redpanda/tests/rptest/tests/tiered_storage_model_test.py", line 112, in setUp
    super(TieredStorageTest, self).setUp()
  File "/home/ubuntu/redpanda/tests/rptest/tests/redpanda_test.py", line 38, in setUp
    self.__redpanda.start()
  File "/home/ubuntu/redpanda/tests/rptest/services/redpanda.py", line 2247, in start
    self.start_si()
  File "/home/ubuntu/redpanda/tests/rptest/services/redpanda.py", line 2707, in start_si
    self.cloud_storage_client.create_bucket(
  File "/home/ubuntu/redpanda/tests/rptest/archival/s3_client.py", line 136, in create_bucket
    res = self._cli.create_bucket(
  File "/usr/local/lib/python3.10/dist-packages/botocore/client.py", line 530, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/usr/local/lib/python3.10/dist-packages/botocore/client.py", line 947, in _make_api_call
    http, parsed_response = self._make_request(
  File "/usr/local/lib/python3.10/dist-packages/botocore/client.py", line 970, in _make_request
    return self._endpoint.make_request(operation_model, request_dict)
  File "/usr/local/lib/python3.10/dist-packages/botocore/endpoint.py", line 119, in make_request
    return self._send_request(request_dict, operation_model)
  File "/usr/local/lib/python3.10/dist-packages/botocore/endpoint.py", line 198, in _send_request
    request = self.create_request(request_dict, operation_model)
  File "/usr/local/lib/python3.10/dist-packages/botocore/endpoint.py", line 134, in create_request
    self._event_emitter.emit(
  File "/usr/local/lib/python3.10/dist-packages/botocore/hooks.py", line 412, in emit
    return self._emitter.emit(aliased_event_name, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/botocore/hooks.py", line 256, in emit
    return self._emit(event_name, kwargs)
botocore.exceptions.NoCredentialsError: Unable to locate credentials