add context argument to resource.nomad_csi_volume

The `context` output is missing from `resource.nomad_csi_volume`. This prevents
successfully migrating from the deprecated `resource.nomad_external_volume`.

Fixes: #494
Ref: https://hashicorp.atlassian.net/browse/NET-11851

nomad/resource_csi_volume.go

@@ -340,6 +340,11 @@ func resourceCSIVolume() *schema.Resource {
 				Computed:    true,
 				Type:        schema.TypeString,
 			},
+			"context": {
+				Description: "The volume context provided by the storage provider",
+				Computed:    true,
+				Type:        schema.TypeMap,
+			},
 		},
 	}
 }
@@ -402,6 +407,7 @@ func resourceCSIVolumeRead(d *schema.ResourceData, meta interface{}) error {
 	d.Set("capability", flattenCSIVolumeCapabilities(volume.RequestedCapabilities))
 	d.Set("topologies", flattenCSIVolumeTopologies(volume.Topologies))
 	d.Set("topology_request", flattenCSIVolumeTopologyRequests(volume.RequestedTopologies))
+	d.Set("context", volume.Context)
 	// The Nomad API redacts `mount_options` and `secrets`, so we don't update them
 	// with the response payload; they will remain as is.
 
@@ -451,6 +457,7 @@ func resourceCSIVolumeCreate(ctx context.Context, d *schema.ResourceData, meta i
 		RequestedTopologies:   topologyRequest,
 		Secrets:               helper.ToMapStringString(d.Get("secrets")),
 		Parameters:            helper.ToMapStringString(d.Get("parameters")),
+		Context:               helper.ToMapStringString(d.Get("context")),
 	}
 
 	// Unpack the mount_options if we have any and configure the volume struct.

website/docs/r/csi_volume.html.markdown

@@ -128,6 +128,7 @@ can be referenced:
 - `nodes_expected`: `(integer)`
 - `schedulable`: `(boolean)`
 - `topologies`: `(List of topologies)`
+- `context`: `(map[string]string)`
 
 ### Timeouts