### 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_
)
        response = lambda_client.get_code_signing_config(CodeSigningConfigArn=code_signing_arn)
        assert 200 == response["ResponseMetadata"]["HTTPStatusCode"]
        snapshot.match("get_code_signing_config", response)
        response = lambda_client.put_function_code_signing_config(
            CodeSigningConfigArn=code_signing_arn, FunctionName=function_name
        )
        assert 200 == response["ResponseMetadata"]["HTTPStatusCode"]
        snapshot.match("put_function_code_signing_config", response)
        response = lambda_client.get_function_code_signing_config(FunctionName=function_name)
        assert 200 == response["ResponseMetadata"]["HTTPStatusCode"]
        snapshot.match("get_function_code_signing_config", response)
        assert code_signing_arn == response["CodeSigningConfigArn"]
        assert function_name == response["FunctionName"]
        response = lambda_client.delete_function_code_signing_config(FunctionName=function_name)
        assert 204 == response["ResponseMetadata"]["HTTPStatusCode"]
        response = lambda_client.delete_code_signing_config(CodeSigningConfigArn=code_signing_arn)
        assert 204 == response["ResponseMetadata"]["HTTPStatusCode"]
    
    def create_multiple_lambda_permissions(self, lambda_client, create_lambda_function, snapshot):
        """Test creating multiple lambda permissions and checking the policy"""
        snapshot.add_transformer(snapshot.transform.lambda_api())
        function_name = f"test-function-{short_uid()}"
        
        create_lambda_function(
            func_name=function_name,
            runtime=LAMBDA_RUNTIME_PYTHON37,
            libs=TEST_LAMBDA_LIBS,
        )
        action = "lambda:InvokeFunction"