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?
TEST_LAMBDA_PYTHON3_MULTIPLE_CREATE1 = os.path.join(THIS_FOLDER, 'lambdas', 'python3', 'lambda1', 'lambda1.zip')
TEST_LAMBDA_PYTHON3_MULTIPLE_CREATE2 = os.path.join(THIS_FOLDER, 'lambdas', 'python3', 'lambda2', 'lambda2.zip')
TEST_LAMBDA_NAME_PY = 'test_lambda_py'
TEST_LAMBDA_NAME_PY3 = 'test_lambda_py3'
TEST_LAMBDA_NAME_JS = 'test_lambda_js'
TEST_LAMBDA_NAME_RUBY = 'test_lambda_ruby'
TEST_LAMBDA_NAME_DOTNETCORE2 = 'test_lambda_dotnetcore2'
TEST_LAMBDA_NAME_DOTNETCORE31 = 'test_lambda_dotnetcore31'
TEST_LAMBDA_NAME_CUSTOM_RUNTIME = 'test_lambda_custom_runtime'
TEST_LAMBDA_NAME_JAVA = 'test_lambda_java'
TEST_LAMBDA_NAME_JAVA_STREAM = 'test_lambda_java_stream'
TEST_LAMBDA_NAME_JAVA_SERIALIZABLE = 'test_lambda_java_serializable'
TEST_LAMBDA_NAME_JAVA_KINESIS = 'test_lambda_java_kinesis'
TEST_LAMBDA_NAME_ENV = 'test_lambda_env'
TEST_LAMBDA_ECHO_FILE = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_echo.py')
TEST_LAMBDA_SEND_MESSAGE_FILE = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_send_message.py')
TEST_LAMBDA_PUT_ITEM_FILE = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_put_item.py')
TEST_LAMBDA_START_EXECUTION_FILE = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_start_execution.py')
TEST_LAMBDA_FUNCTION_PREFIX = 'lambda-function'
TEST_SNS_TOPIC_NAME = 'sns-topic-1'
TEST_STAGE_NAME = 'testing'
MAVEN_BASE_URL = 'https://repo.maven.apache.org/maven2'
TEST_LAMBDA_JAR_URL = '{url}/cloud/localstack/{name}/{version}/{name}-{version}-tests.jar'.format(
    version=LOCALSTACK_MAVEN_VERSION, url=MAVEN_BASE_URL, name='localstack-utils')
TEST_LAMBDA_LIBS = [
    'localstack', 'localstack_client', 'requests', 'psutil', 'urllib3', 'chardet', 'certifi', 'idna', 'pip', 'dns'
]
def _run_forward_to_fallback_url(url, fallback=True, lambda_name=None, num_requests=3):
    lambda_client = aws_stack.connect_to_service('lambda')
    if fallback: