AWS supports the following Ruby runtimes:

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Name | Identifier | SDK for Ruby | Operating system
-- | -- | -- | --
Ruby 2.7 | ruby2.7 | 3.0.1 | Amazon Linux 2
Ruby 2.5 | ruby2.5 | 3.0.1 | Amazon Linux

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Currently, `localstack/lambda` only contains the `ruby2.5` tag. Will the 2.7 runtime be supported in the (near) future?
handler_file=TEST_LAMBDA_ECHO_FILE,
            func_name=function_name,
            runtime=LAMBDA_RUNTIME_PYTHON36
        )
        response = lambda_client.put_function_concurrency(
            FunctionName=function_name,
            ReservedConcurrentExecutions=123
        )
        self.assertIn('ReservedConcurrentExecutions', response)
        response = lambda_client.get_function_concurrency(FunctionName=function_name)
        self.assertIn('ReservedConcurrentExecutions', response)
        response = lambda_client.delete_function_concurrency(FunctionName=function_name)
        self.assertNotIn('ReservedConcurrentExecutions', response)
        testutil.delete_lambda_function(name=function_name)
    def test_function_code_signing_config(self):
        lambda_client = aws_stack.connect_to_service('lambda')
        function_name = 'lambda_func-{}'.format(short_uid())
        testutil.create_lambda_function(
            handler_file=TEST_LAMBDA_ECHO_FILE,
            func_name=function_name,
            runtime=LAMBDA_RUNTIME_PYTHON36
        )
        response = lambda_client.create_code_signing_config(
            Description='Testing CodeSigning Config',
            AllowedPublishers={
                'SigningProfileVersionArns': [
                    'arn:aws:signer:us-east-1:000000000000:/signing-profiles/test',
                ]
            },
            CodeSigningPolicies={