### 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_
PYTHON_TEST_RUNTIMES,
)
class TestPythonRuntimes:
    @pytest.fixture(
        params=PYTHON_TEST_RUNTIMES,
    )
    def python_function_name(self, request, lambda_client, create_lambda_function):
        function_name = f"python-test-function-{short_uid()}"
        create_lambda_function(
            func_name=function_name,
            handler_file=TEST_LAMBDA_PYTHON,
            libs=TEST_LAMBDA_LIBS,
            runtime=request.param,
        )
        return function_name
    @pytest.mark.skip_snapshot_verify(
        paths=["$..Payload.context.memory_limit_in_mb", "$..logs.logs"]
    )
    def test_invocation_type_not_set(self, lambda_client, python_function_name, snapshot):
        """Test invocation of a lambda with no invocation type set, but LogType="Tail""" ""
        snapshot.add_transformer(snapshot.transform.lambda_api())
        snapshot.add_transformer(
            snapshot.transform.key_value("LogResult", reference_replacement=False)
        )
        result = lambda_client.invoke(
            FunctionName=python_function_name, Payload=b"{}", LogType="Tail"
        )
        result = read_streams(result)
        snapshot.match("invoke", result)
        result_data = json.loads(result["Payload"])