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?
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        ctx = {'custom': {'foo': 'bar'},
               'client': {'snap': ['crackle', 'pop']},
               'env': {'fizz': 'buzz'}}
        result = self.lambda_client.invoke(
            FunctionName=TEST_LAMBDA_NAME_JS, Payload=b'{}',
            ClientContext=to_str(base64.b64encode(to_bytes(json.dumps(ctx)))))
        result_data = result['Payload'].read()
        self.assertEqual(result['StatusCode'], 200)
        self.assertEqual(json.loads(json.loads(result_data)['context']['clientContext']).
                         get('custom').get('foo'), 'bar')
        
        expected = ['.*Node.js Lambda handler executing.']
        self.check_lambda_logs(TEST_LAMBDA_NAME_JS, expected_lines=expected)
        
        testutil.delete_lambda_function(TEST_LAMBDA_NAME_JS)
    def test_invoke_nodejs_lambda(self):
        if not use_docker():
            return
        handler_file = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_handler.js')
        testutil.create_lambda_function(
            func_name=TEST_LAMBDA_NAME_JS,
            zip_file=testutil.create_zip_file(handler_file, get_content=True),
            runtime=LAMBDA_RUNTIME_NODEJS14X,
            handler='lambda_handler.handler'
        )
        rs = self.lambda_client.invoke(
            FunctionName=TEST_LAMBDA_NAME_JS,
            Payload=json.dumps({
                'event_type': 'test_lambda'