Fix CI

Dependencies

• [2] EGQ4SEV5 Add demo for 04

Change contents

• edit in 04-cmake-and-cross/demo.sh at line 8
  [2.902]

  [2.902]
  +

  + file_cmd="nix run github:nixos/nixpkgs/008ce261a7e3c532e792cb8e39482f2cc1b192f5#file"
• replacement in 04-cmake-and-cross/demo.sh at line 41
  [2.1949]→[2.1949:1980](∅→∅)
  − x file ./result/bin/wttr-delft
  [2.1949]

  [2.1980]
  + x "${file_cmd}" ./result/bin/wttr-delft
• replacement in 04-cmake-and-cross/demo.sh at line 45
  [2.2107]→[2.2107:2138](∅→∅)
  − x file ./result/bin/wttr-delft
  [2.2107]

  [2.2138]
  + x "${file_cmd}" ./result/bin/wttr-delft
• edit in 04-cmake-and-cross/demo.sh at line 48
  [2.2234]
  +

  + p