### 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_
:param lambda_function: function details
        :return: the InvocationResult
        """
        env_vars = lambda_function and lambda_function.envvars
        kwargs = {"stdin": True, "inherit_env": True, "asynchronous": True, "env_vars": env_vars}
        process = run(cmd, stderr=subprocess.PIPE, outfile=subprocess.PIPE, **kwargs)
        result, log_output = process.communicate()
        try:
            result = to_str(result).strip()
        except Exception:
            pass
        log_output = to_str(log_output).strip()
        return_code = process.returncode
        
        
        
        
        if isinstance(result, str) and "\n" in result:
            lines = result.split("\n")
            idx = last_index_of(
                lines, lambda line: line and not line.startswith(INTERNAL_LOG_PREFIX)
            )
            if idx >= 0:
                result = lines[idx]
                additional_logs = "\n".join(lines[:idx] + lines[idx + 1 :])
                log_output += "\n%s" % additional_logs
        func_arn = lambda_function and lambda_function.arn()
        output = OutputLog(result, log_output)
        LOG.debug(
            f"Lambda {func_arn} result / log output:"