Create a Nix flake configuration at /app/flake.nix for a NixOS virtual machine targeting aarch64-linux …

Create a Nix flake configuration at /app/flake.nix for a NixOS virtual machine targeting aarch64-linux …: a task in rts-1k-rootless-apptainer: RTS-1K: offline rootless Apptainer release (Harbor dataset). What the agent is asked, how it is graded, what it runs in, and its files.