Merge ~adam-collard/maas-ci/+git/system-tests:yaml-split-config-check into ~maas-committers/maas-ci/+git/system-tests:master

[Adam Collard]

Use ruamel.yaml to parse YAML 1.2 docs that come out of gen_config

Avoids issue with "no" -> no -> False

[MAAS Lander (maas-lander)]

UNIT TESTS
-b yaml-split-config-check lp:~adam-collard/maas-ci/+git/system-tests into -b master lp:~maas-committers/maas-ci/+git/system-tests

STATUS: SUCCESS
COMMIT: d3aa37f0f5f7c247dd283077c8ac0bb268ddbaed

review: Approve

[Anton Troyanov (troyanov)]

review: Approve

diff --git a/setup.py b/setup.py
index 10c8b5e..21d75cd 100644
--- a/setup.py
+++ b/setup.py
@@ -8,6 +8,7 @@ install_requires = (
     'pytest-steps',
     'pyyaml',
     'retry',
+    'ruamel.yaml',
 )
 
 
diff --git a/systemtests/conftest.py b/systemtests/conftest.py
index e669a69..234c9fa 100644
--- a/systemtests/conftest.py
+++ b/systemtests/conftest.py
@@ -4,7 +4,7 @@ from logging import getLogger
 from typing import TYPE_CHECKING, Any, Iterator
 
 import pytest
-import yaml
+from ruamel.yaml import YAML
 
 if TYPE_CHECKING:
     from .api import AuthenticatedAPIClient
@@ -75,11 +75,13 @@ STATUS_READY = 4
 
 LOG = getLogger("systemtests.conftest")
 
+yaml = YAML()
+
 
 def pytest_addoption(parser: Parser) -> None:
     def config_type(filename: str) -> dict[str, Any]:
         with open(filename, "r") as fh:
-            config: dict[str, Any] = yaml.safe_load(fh)
+            config: dict[str, Any] = yaml.load(fh)
         return config
 
     parser.addoption(