### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

The use case I have in mind is to run Node 16.x Lambdas - the default container registry is `lambci/lambda` which is effectively abandoned. [Not even Node 14.x has been published](https://github.com/lambci/docker-lambda/pull/330). However, switching the registry over to [`amazon/aws-lambda-nodejs`](https://hub.docker.com/r/amazon/aws-lambda-nodejs) still fails to pull the container, since localstack is looking for the tag `nodejs16.x`. I'd like to be able to specify that if the runtime is `nodejs16.x` it just looks for tag `16`.

### 🧑‍💻 Implementation

_No response_

### Anything else?

_No response_
(TEST_LAMBDA_TIMEOUT_PYTHON, LAMBDA_RUNTIME_PYTHON38),
        ],
        ids=["python"],
    )
    @pytest.mark.skip_snapshot_verify
    def test_lambda_no_timeout_logs(
        self,
        lambda_client,
        create_lambda_function,
        lambda_fn,
        lambda_runtime,
        logs_client,
        snapshot,
    ):
        """tests the local context reuse of packages in AWS lambda"""
        snapshot.add_transformer(snapshot.transform.lambda_api())
        func_name = f"test_lambda_{short_uid()}"
        create_result = create_lambda_function(
            func_name=func_name,
            handler_file=lambda_fn,
            runtime=lambda_runtime,
            client=lambda_client,
            timeout=2,
        )
        snapshot.match("create-result", create_result)
        result = lambda_client.invoke(FunctionName=func_name, Payload=json.dumps({"wait": 1}))
        snapshot.match("invoke-result", result)
        assert result["StatusCode"] == 200
        log_group_name = f"/aws/lambda/{func_name}"
        def _log_stream_available():