### 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_
assert (
            get_invoke_init_type(lambda_client, func_name, alias_name) == "provisioned-concurrency"
        )
        # ProvisionedConcurrencyConfig should only be "registered" to the alias, not the referenced version
        with pytest.raises(Exception) as e:
            lambda_client.get_provisioned_concurrency_config(
                FunctionName=func_name, Qualifier=new_version["Version"]
            )
        e.match("ProvisionedConcurrencyConfigNotFoundException")
    @pytest.mark.skip(reason="very slow (only execute when needed)")
    def test_lambda_provisioned_concurrency_doesnt_apply_to_latest(
        self, lambda_client, logs_client, create_lambda_function
    ):
        """create fn ⇒ publish version ⇒ provisioned concurrency @version ⇒ test if it applies to call to $LATEST"""
        func_name = f"test_lambda_{short_uid()}"
        create_lambda_function(
            func_name=func_name,
            handler_file=TEST_LAMBDA_INTROSPECT_PYTHON,
            runtime=LAMBDA_RUNTIME_PYTHON38,
            client=lambda_client,
            timeout=2,
        )
        fn = lambda_client.get_function_configuration(FunctionName=func_name, Qualifier="$LATEST")
        assert fn["State"] == "Active"
        first_ver = lambda_client.publish_version(
            FunctionName=func_name, RevisionId=fn["RevisionId"], Description="my-first-version"
        )
        assert first_ver["State"] == "Active"
        assert fn["RevisionId"] != first_ver["RevisionId"]
        assert (