Only rebuild the vm integration test in interactive mode

Dependencies

• [2] BH5XPS7C Add 07-vm-integration test
• [3] 3GPSC2KX Add compatibility checks for fancy parts of the demos

Change contents

• replacement in 07-vm-integration-test/demo.sh at line 43
  [2.5994]→[2.5994:6028](∅→∅)
  − x nix build "${dir}" -L --rebuild
  [2.5994]

  [2.6028]
  + i nix build "${dir}" -L --rebuild