fix: adjust the update build command in the container (#149)

This PR simply update the nix command in the container to run correctly

Author: drbh

dockerfiles/Dockerfile

@@ -99,7 +99,7 @@ function build_extension {
   ensure_flake_exists "${work_dir}"
 
   # Make sure the build is up to date
-  nix run .#update-build
+  nix run github:huggingface/kernel-builder#update-build -- build.toml
 
   # Pure bundle build
   echo "Building with Nix..."

dockerfiles/Dockerfile.user

@@ -118,7 +118,7 @@ function build_extension {
   ensure_flake_exists
 
   # Make sure the build is up to date
-  nix run .#update-build
+  nix run github:huggingface/kernel-builder#update-build -- build.toml
 
   # Pure bundle build
   # TODO: remove the "bundle" after resolving