layers: propagate down the idmapping settings

when creating a layer, propagate down the idmapping.

Signed-off-by: Giuseppe Scrivano <giuseppe@scrivano.org>

drivers/driver.go

@@ -40,6 +40,7 @@ var (
 type CreateOpts struct {
 	MountLabel string
 	StorageOpt map[string]string
+	*idtools.IDMappings
 }
 
 // MountOpts contains optional arguments for LayerStope.Mount() methods.

layers.go

@@ -614,6 +614,7 @@ func (r *layerStore) Put(id string, parentLayer *Layer, names []string, mountLab
 	opts := drivers.CreateOpts{
 		MountLabel: mountLabel,
 		StorageOpt: options,
+		IDMappings: idMappings,
 	}
 	if moreOptions.TemplateLayer != "" {
 		if err = r.driver.CreateFromTemplate(id, moreOptions.TemplateLayer, templateIDMappings, parent, parentMappings, &opts, writeable); err != nil {