### 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_
),
        ],
    )
    
    @pytest.mark.skip_snapshot_verify
    def test_java_custom_handler_method_specification(
        self,
        lambda_client,
        create_lambda_function,
        handler,
        expected_result,
        check_lambda_logs,
        snapshot,
    ):
        snapshot.add_transformer(snapshot.transform.lambda_api())
        java_handler_multiple_handlers = load_file(TEST_LAMBDA_JAVA_MULTIPLE_HANDLERS, mode="rb")
        expected = ['.*"echo": "echo".*']
        function_name = f"lambda_handler_test_{short_uid()}"
        create_result = create_lambda_function(
            func_name=function_name,
            zip_file=java_handler_multiple_handlers,
            runtime=LAMBDA_RUNTIME_JAVA11,
            handler=handler,
        )
        snapshot.match("create-result", create_result)
        result = lambda_client.invoke(FunctionName=function_name, Payload=b'{"echo":"echo"}')
        result = read_streams(result)
        snapshot.match("invoke-result", result)
        result_data = result["Payload"]
        assert 200 == result["StatusCode"]