this derivation will be built:
  /nix/store/mscym9dgz2dqc7db8z0ir0nkxvbfzhv3-cargo-nix-plugin-git-source-test.drv
building '/nix/store/mscym9dgz2dqc7db8z0ir0nkxvbfzhv3-cargo-nix-plugin-git-source-test.drv' on 'ssh-ng://nix@jamie'