devshell: fix nvfetcher rebuilding, simplify with

alias

shell/devos.nix

@@ -39,16 +39,15 @@ in {
   # override for our own welcome
   devshell.name = pkgs.lib.mkForce "PubSolarOS";
 
+  devshell.startup.aliases.text = ''
+    alias nvfetcher="nvfetcher --config $PRJ_ROOT/sources.toml --build-dir PRJ_ROOT/pkgs/_sources"
+  '';
+
   commands = with pkgs;
     [
       (devos nix)
       (devos agenix)
-      {
-        category = "devos";
-        name = pkgs.nvfetcher.pname;
-        help = pkgs.nvfetcher.meta.description;
-        command = "cd $PRJ_ROOT/pkgs; ${pkgs.nvfetcher}/bin/nvfetcher -c ./sources.toml $@";
-      }
+      (devos nvfetcher)
       (linter alejandra)
       (linter editorconfig-checker)
       (linter nodePackages.prettier)