these 2 derivations will be built:
  /nix/store/ycs3vrynkbav756jd8a3idsp9izfa60h-resulting-skills-tree.drv
  /nix/store/jygdysxy103dwp7ih6mpczmwmw25m814-validate-skills.drv
cannot build on 'ssh-ng://nix-remote-builder@100.122.4.173': error: failed to start SSH connection to '100.122.4.173'
cannot build on 'ssh-ng://nix-remote-builder@100.122.21.36': error: failed to start SSH connection to '100.122.21.36'