### 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_
):
        snapshot.add_transformer(snapshot.transform.lambda_api())
        snapshot.add_transformer(snapshot.transform.s3_api())
        snapshot.add_transformer(snapshot.transform.key_value("Sid"))
        topic_name = f"topic-{short_uid()}"
        key = f"key-{short_uid()}"
        function_name = simple_java_lambda
        function_result = lambda_client.get_function(FunctionName=function_name)
        snapshot.match("get-function", function_result)
        function_arn = function_result["Configuration"]["FunctionArn"]
        permission_id = f"test-statement-{short_uid()}"
        topic_arn = sns_create_topic(Name=topic_name)["TopicArn"]
        s3_sns_policy = f"""{{
            "Version": "2012-10-17",
            "Id": "example-ID",
            "Statement": [
                {{
                    "Sid": "Example SNS topic policy",
                    "Effect": "Allow",
                    "Principal": {{
                        "Service": "s3.amazonaws.com"
                    }},
                    "Action": [
                        "SNS:Publish"
                    ],
                    "Resource": "{topic_arn}",
                    "Condition": {{
                        "ArnLike": {{
                            "aws:SourceArn": "arn:aws:s3:*:*:{s3_bucket}"
                        }}