YAML format of `rules get` should match `rules sync` about cortex-tools HOT 2 OPEN

$ cortextool rules print --disable-color > tmp.yml
$ cortextool rules sync tmp.yml 
ERRO[0000] unable parse rules file                       error="yaml: unmarshal errors:\n  line 1: field group1 not found in type rules.RuleNamespace\n  line 13: field group2 not found in type rules.RuleNamespace" file=tmp.yml
cortextool: error: sync operation unsuccessful, unable to parse rules files: file read error, try --help

$ cortextool rules print --disable-color > tmp.yml
$ ./split.py tmp.yml
$ rules check --rule-dirs=rules && echo OK
OK

#!/usr/bin/env python3

import argparse
import os
import yaml


def _load_yaml(path):
    with open(path) as file:
        return yaml.load(file, Loader=yaml.FullLoader)


def _write_yaml(data, path):
    with open(path, "w") as file:
        yaml.dump(data, file, sort_keys=False, width=9999)


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("namespaces_file", type=str)
    args = parser.parse_args()

    base_dir = os.path.dirname(os.path.abspath(args.namespaces_file))
    rules_dir = os.path.join(base_dir, "rules")
    os.makedirs(rules_dir)

    for namespace, groups in _load_yaml(args.namespaces_file).items():
        _write_yaml(
            data={"namespace": namespace, "groups": groups},
            path=os.path.join(rules_dir, f"{namespace}.yaml"),
        )


if __name__ == "__main__":
    main()