Change error message for devbox add when a package is not found

Author: LucilleH

internal/boxcli/add.go

@@ -10,10 +10,9 @@ import (
 	"github.com/spf13/cobra"
 	"go.jetpack.io/devbox"
 	"go.jetpack.io/devbox/internal/boxcli/usererr"
-	"go.jetpack.io/devbox/internal/nix"
 )
 
-const toSearchForPackages = "To search for packages use https://search.nixos.org/packages"
+const toSearchForPackages = "To search for packages, use the `devbox search` command"
 
 type addCmdFlags struct {
 	config configFlags
@@ -37,7 +36,7 @@ func addCmd() *cobra.Command {
 				return nil
 			}
 			err := addCmdFunc(cmd, args, flags)
-			if errors.Is(err, nix.ErrPackageNotFound) {
+			if err != nil {
 				return usererr.New("%s\n\n%s", err, toSearchForPackages)
 			}
 			return err