CI: replace yaml lib

yaml was removed from core in some version between 3.8 and 3.10.

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install --upgrade black pytest sh
+          python -m pip install --upgrade black
       - name: Check Python formatting
         run: |
           set -eux
@@ -37,7 +37,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install --upgrade pytest sh
+          pip install --upgrade pytest sh ruamel.yaml
       - name: Running addons tests
         run: |
           set -x

tests/test-addons.py

@@ -1,13 +1,17 @@
 import sh
-import yaml
+
+from ruamel.yaml import YAML
 
 from utils import microk8s_enable, wait_for_pod_state, microk8s_disable
 
 
+yaml = YAML(typ="safe")
+
+
 class TestAddons(object):
     def test_python_demo_nginx(self):
         microk8s_enable("python-hello-k8s")
         wait_for_pod_state("", "default", "running", label="app=python-demo-nginx")
-        status = yaml.safe_load(sh.microk8s.status(format="yaml").stdout)
+        status = yaml.load(sh.sudo.microk8s.status(format="yaml").stdout)
         expected = {"python-hello-k8s": "enabled"}
         microk8s_disable("python-hello-k8s")

tests/utils.py

@@ -1,7 +1,11 @@
 import datetime
 import time
-import yaml
+
 from subprocess import check_output, CalledProcessError
+from ruamel.yaml import YAML
+
+
+yaml = YAML(typ="safe")
 
 
 def run_until_success(cmd, timeout_insec=60, err_out=None):
@@ -58,7 +62,7 @@ def kubectl_get(target, timeout_insec=300):
     """
     cmd = "get -o yaml " + target
     output = kubectl(cmd, timeout_insec)
-    return yaml.safe_load(output)
+    return yaml.load(output)
 
 
 def wait_for_pod_state(