### 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 simple provided lambda (with curl as RIC) invocation"""
        snapshot.add_transformer(snapshot.transform.lambda_api())
        function_name = f"test-function-{short_uid()}"
        result = create_lambda_function(
            func_name=function_name,
            handler_file=TEST_LAMBDA_CUSTOM_RUNTIME,
            handler="function.handler",
            runtime=runtime,
        )
        snapshot.match("create-result", result)
        result = lambda_client.invoke(
            FunctionName=function_name,
            Payload=b'{"text": "bar with \'quotes\\""}',
        )
        result = read_streams(result)
        snapshot.match("invoke-result", result)
        result_data = result["Payload"]
        assert 200 == result["StatusCode"]
        result_data = result_data.strip()
        
        assert result_data in (
            """Echoing request: '{"text": "bar with \'quotes\\""}'""",
            """Echoing request: '{"text":"bar with \'quotes\\""}'""",
        )
        
        expected = [".*Custom Runtime Lambda handler executing."]
        def check_logs():
            check_lambda_logs(function_name, expected_lines=expected)
        retry(check_logs, retries=20)