fix(instance): add a wait before resizing volume (#780)

Author: remyleone

scaleway/resource_instance_volume.go

@@ -171,9 +171,15 @@ func resourceScalewayInstanceVolumeUpdate(ctx context.Context, d *schema.Resourc
 		if oldSize, newSize := d.GetChange("size_in_gb"); oldSize.(int) > newSize.(int) {
 			return diag.FromErr(fmt.Errorf("block volumes cannot be resized down"))
 		}
+		_, err := instanceAPI.WaitForVolume(&instance.WaitForVolumeRequest{
+			VolumeID: id,
+			Zone:     zone}, scw.WithContext(ctx))
+		if err != nil {
+			return diag.FromErr(err)
+		}
 
 		volumeSizeInBytes := scw.Size(uint64(d.Get("size_in_gb").(int)) * gb)
-		_, err := instanceAPI.UpdateVolume(&instance.UpdateVolumeRequest{
+		_, err = instanceAPI.UpdateVolume(&instance.UpdateVolumeRequest{
 			VolumeID: id,
 			Zone:     zone,
 			Size:     &volumeSizeInBytes,