Configure file for CP kubelet options

Passing options such as the one for serializing image pulls has been
deprecated (see warning `Flag --serialize-image-pulls has been
deprecated`), so do as the warning suggests and pass these in to a file.

charts/cluster-api-cluster-openstack/templates/control-plane.yaml

@@ -22,23 +22,25 @@ spec:
         name: {{ "'{{ local_hostname }}'" }}
         kubeletExtraArgs:
           cloud-provider: external
-          serialize-image-pulls: "true"
           node-labels: {{- include "openstack.nodelabels.control-plane" . | nindent 12 }}
         taints:
           {{- include "openstack.taints.control-plane" . | nindent 8 }}
       {{- if .Values.controlPlane.kubeadmSkipPhases }}
       skipPhases:
         {{- toYaml $.Values.controlPlane.kubeadmSkipPhases | nindent 6 }}
       {{- end }}
+      patches:
+        directory: /etc/kubernetes/patches
     joinConfiguration:
       nodeRegistration:
         name: {{ "'{{ local_hostname }}'" }}
         kubeletExtraArgs:
           cloud-provider: external
-          serialize-image-pulls: "true"
           node-labels: {{- include "openstack.nodelabels.control-plane" . | nindent 12 }}
         taints:
           {{- include "openstack.taints.control-plane" . | nindent 8 }}
+      patches:
+        directory: /etc/kubernetes/patches
     clusterConfiguration:
       apiServer:
         extraArgs:
@@ -65,6 +67,16 @@ spec:
         extraArgs:
           authorization-always-allow-paths: "/healthz,/readyz,/livez,/metrics"
           bind-address: "0.0.0.0"
+    files:
+    {{- with $config := .Values.controlPlane.kubelet -}}
+    {{ $_ := set $config "apiVersion" "kubelet.config.k8s.io/v1beta1" -}}
+    {{ $_ := set $config "kind" "KubeletConfiguration" }}
+    - path: /etc/kubernetes/patches/kubeletconfiguration0+strategic.json
+      owner: "root:root"
+      permissions: "0644"
+      content: |
+        {{ $config | toJson }}
+    {{- end }}
 ---
 apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
 kind: OpenStackMachineTemplate

charts/cluster-api-cluster-openstack/values.yaml

@@ -98,6 +98,10 @@ controlPlane:
     # Set the server group of the control plane (e.g. anti-affinity rules).
     # serverGroupID: foo
 
+  # Any additional configuration to be passed to the kubelet can be specifed here
+  kubelet:
+    serializeImagePulls: false
+
 # Workload pools topology.
 # workloadPools:
 #  # Pool name
@@ -141,7 +145,7 @@ controlPlane:
 #    # Additional configuration to be passed to the kubelet can be specifed here
 #    kubelet:
 #      # For example:
-#      serializeImagePulls: "false"
+#      serializeImagePulls: false
 #
 #    # Enable or disable cluster autoscaling.
 #    # This object is considered immutable.