feat(tvix/store): enable name customization in the store

Sometimes, Nix lets someone customize the `name` in the store for a
path, this is the case for `builtins.path` which takes a `name`
argument, we leave it to the caller to choose the name, which can be the
basename by default of the path.

Change-Id: Icdbf71d1d8f2dca5716b99d20aac885aab905b80
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10653
Tested-by: BuildkiteCI
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Reviewed-by: flokli <flokli@flokli.de>

tvix/glue/src/tvix_store_io.rs

@@ -276,6 +276,7 @@ impl EvalIO for TvixStoreIO {
         let output_path = self.tokio_handle.block_on(async {
             tvix_store::import::import_path_as_nar_ca(
                 path,
+                tvix_store::import::path_to_name(path)?,
                 &self.blob_service,
                 &self.directory_service,
                 &self.path_info_service,