### 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_
lambda_function: LambdaFunction,
        env_vars: Dict,
        lambda_cwd: str,
        docker_flags: str = None,
    ):
        docker_image = Util.docker_image_for_lambda(lambda_function)
        container_config = LambdaContainerConfiguration(image_name=docker_image)
        container_config.name = self.get_container_name(lambda_function.arn())
        
        env_vars.pop("AWS_LAMBDA_EVENT_BODY", None)
        container_config.env_vars = env_vars
        container_config.network = get_container_network_for_lambda()
        container_config.additional_flags = docker_flags
        container_config.dns = config.LAMBDA_DOCKER_DNS
        if lambda_cwd:
            if config.LAMBDA_REMOTE_DOCKER:
                container_config.required_files.append((f"{lambda_cwd}/.", DOCKER_TASK_FOLDER))
            else:
                lambda_cwd_on_host = Util.get_host_path_for_path_in_docker(lambda_cwd)
                
                if ":" in lambda_cwd and "\\" in lambda_cwd:
                    lambda_cwd_on_host = Util.format_windows_path(lambda_cwd_on_host)
                container_config.required_files.append((lambda_cwd_on_host, DOCKER_TASK_FOLDER))
        container_config.entrypoint = "/bin/bash"
        container_config.interactive = True
        if config.LAMBDA_STAY_OPEN_MODE:
            container_config.env_vars["DOCKER_LAMBDA_STAY_OPEN"] = "1"
            
            container_config.env_vars.pop("DOCKER_LAMBDA_USE_STDIN", None)
            container_config.entrypoint = None