### 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_
f"\n{output.stdout_formatted()}"
            f"\n>{output.stderr_formatted()}"
        )
        
        
        if return_code != 0:
            output.output_file()
            raise InvocationException(
                "Lambda process returned error status code: %s. Result: %s. Output:\n%s"
                % (return_code, result, log_output),
                log_output,
                result,
            )
        invocation_result = InvocationResult(result, log_output=log_output)
        return invocation_result
    def _execute(
        self, lambda_function: LambdaFunction, inv_context: InvocationContext
    ) -> InvocationResult:
        
        result = self.apply_plugin_patches(inv_context)
        if isinstance(result, InvocationResult):
            return result
        lambda_cwd = lambda_function.cwd
        environment = self._prepare_environment(lambda_function)
        environment["LOCALSTACK_HOSTNAME"] = config.LOCALSTACK_HOSTNAME
        environment["EDGE_PORT"] = str(config.EDGE_PORT)
        if lambda_function.timeout:
            environment["AWS_LAMBDA_FUNCTION_TIMEOUT"] = str(lambda_function.timeout)
        context = inv_context.context
        if context: