### 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_
opts = config.LAMBDA_JAVA_OPTS or ""
        
        if "_debug_port_" in opts:
            if not cls.debug_java_port:
                cls.debug_java_port = get_free_tcp_port()
            opts = opts.replace("_debug_port_", ("%s" % cls.debug_java_port))
        else:
            
            m = re.match(".*address=(.+:)?(\\d+).*", opts)
            if m is not None:
                cls.debug_java_port = m.groups()[1]
        return opts
    @classmethod
    def get_host_path_for_path_in_docker(cls, path):