feat(k8s): add default cni (cilium) for cluster create (#1778)

Co-authored-by: Rémy Léone <[email protected]>

Author: scaleway-bot

cmd/scw/testdata/test-all-usage-k8s-cluster-create-usage.golden

@@ -18,7 +18,7 @@ ARGS:
   [description]                                          The description of the cluster
   [tags.{index}]                                         The tags associated with the cluster
   version                                                The Kubernetes version of the cluster
-  cni                                                    The Container Network Interface (CNI) plugin that will run in the cluster (unknown_cni | cilium | calico | weave | flannel)
+  cni=cilium                                             The Container Network Interface (CNI) plugin that will run in the cluster (unknown_cni | cilium | calico | weave | flannel)
   [enable-dashboard]                                     The enablement of the Kubernetes Dashboard in the cluster
   [ingress]                                              The Ingress Controller that will run in the cluster (unknown_ingress | none | nginx | traefik | traefik2)
   pools.{index}.name                                     The name of the pool

internal/namespaces/k8s/v1/custom_cluster.go

@@ -85,6 +85,9 @@ func clusterAvailableVersionsListBuilder(c *core.Command) *core.Command {
 
 func clusterCreateBuilder(c *core.Command) *core.Command {
 	c.WaitFunc = waitForClusterFunc(clusterActionCreate)
+
+	c.ArgSpecs.GetByName("cni").Default = core.DefaultValueSetter("cilium")
+
 	return c
 }