these 2 derivations will be built:
  /nix/store/dara9njkg91h8x78gpq4rwz5sz7njva6-resulting-skills-tree.drv
  /nix/store/cgfqrv2anhfyvh5r1dsv8hj3la321a46-validate-skills.drv
cannot build on 'ssh-ng://nix-remote-builder@100.122.21.36': error: failed to start SSH connection to '100.122.21.36'