Create a local output directory per execution.

    We've seen occassional (1/100000) perm issues with lambda on temp
    directory and changing unix execution users (2015-2018), so use a
    per execution temp space. With firecracker lambdas this may be outdated.

def get_local_output_dir():
    """Create a local output directory per execution.

    We've seen occassional (1/100000) perm issues with lambda on temp
    directory and changing unix execution users (2015-2018), so use a
    per execution temp space. With firecracker lambdas this may be outdated.
    """
    output_dir = os.environ.get('C7N_OUTPUT_DIR', '/tmp/' + str(uuid.uuid4()))
    if not os.path.exists(output_dir):
        try:
            os.mkdir(output_dir)
        except OSError as error:
            log.warning("Unable to make output directory: {}".format(error))
    return output_dir