fix: tarball builder unable to run with HOME set

Fixes #338

Author: terlar

modules/build-tarball.nix

@@ -68,7 +68,7 @@ in
           --substituters ""
 
         echo "[NixOS-WSL] Adding channel..."
-        nixos-enter --root "$root" --command 'nix-channel --add https://github.com/nix-community/NixOS-WSL/archive/refs/heads/main.tar.gz nixos-wsl'
+        nixos-enter --root "$root" --command 'HOME=/root nix-channel --add https://github.com/nix-community/NixOS-WSL/archive/refs/heads/main.tar.gz nixos-wsl'
 
         echo "[NixOS-WSL] Adding default config..."
         install -Dm644 ${defaultConfig} "$root/etc/nixos/configuration.nix"