When building flakes with the new nix command there is the handy --redirect to temporarily redirect a flake input i.e. to a local directory, for rapid development.
Is the same possible when running nixos-rebuild switch --flake? I would like to avoid having to commit, push and pull on every input repo that I own, every time I make an upstream change on my nixos system.
Or is it maybe possible to build the system using nix build and then applying it using nixos-rebuild ?