these 2 derivations will be built:
  /nix/store/ksaili1l4j99ypxdaapm44zlspg3c760-resulting-skills-tree.drv
  /nix/store/9ls1s169jf6qrnr921n9w8zs8zrqp5yp-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'
cannot build on 'ssh-ng://nix-remote-builder@100.122.4.173': error: failed to start SSH connection to '100.122.4.173'