feat(k8s): add support for configurable root volume (#1364)

Author: jtherin

docs/resources/k8s_pool.md

@@ -74,6 +74,10 @@ The following arguments are supported:
 
     - `max_unavailable` - (Defaults to `1`) The maximum number of nodes that can be not ready at the same time
 
+- `root_volume_type` - (Optional) System volume type of the nodes composing the pool
+
+- `root_volume_size_in_gb` - (Optional) The size of the system volume of the nodes in gigabyte
+
 - `zone` - (Defaults to [provider](../index.md#zone) `zone`) The [zone](../guides/regions_and_zones.md#regions) in which the pool should be created.
 ~> **Important:** Updates to this field will recreate a new resource.
 

scaleway/resource_k8s_pool.go

@@ -139,6 +139,22 @@ func resourceScalewayK8SPool() *schema.Resource {
 					},
 				},
 			},
+			"root_volume_type": {
+				Type:        schema.TypeString,
+				Optional:    true,
+				ForceNew:    true,
+				Description: "System volume type of the nodes composing the pool",
+				ValidateFunc: validation.StringInSlice([]string{
+					k8s.PoolVolumeTypeBSSD.String(),
+					k8s.PoolVolumeTypeLSSD.String(),
+				}, false),
+			},
+			"root_volume_size_in_gb": {
+				Type:        schema.TypeInt,
+				Optional:    true,
+				ForceNew:    true,
+				Description: "The size of the system volume of the nodes in gigabyte",
+			},
 			"zone":   zoneSchema(),
 			"region": regionSchema(),
 			// Computed elements
@@ -253,6 +269,15 @@ func resourceScalewayK8SPoolCreate(ctx context.Context, d *schema.ResourceData,
 		upgradePolicyReq.MaxUnavailable = scw.Uint32Ptr(uint32(maxUnavailable.(int)))
 	}
 
+	if volumeType, ok := d.GetOk("root_volume_type"); ok {
+		req.RootVolumeType = k8s.PoolVolumeType(volumeType.(string))
+	}
+
+	if volumeSize, ok := d.GetOk("root_volume_size_in_gb"); ok {
+		volumeSizeInBytes := scw.Size(uint64(volumeSize.(int)) * gb)
+		req.RootVolumeSize = &volumeSizeInBytes
+	}
+
 	// check if the cluster is waiting for a pool
 	cluster, err := k8sAPI.GetCluster(&k8s.GetClusterRequest{
 		ClusterID: expandID(d.Get("cluster_id")),