Merge pull request #13794 from NixOS/mergify/bp/2.28-maintenance/pr-13202

Fix nix-copy-closure VM test (backport #13202)

Author: xokdvium

tests/nixos/nix-copy-closure.nix

@@ -61,12 +61,10 @@ in
         "${pkgs.openssh}/bin/ssh-keygen", "-t", "ed25519", "-f", "key", "-N", ""
       ], capture_output=True, check=True)
 
-      client.succeed("mkdir -m 700 /root/.ssh")
       client.copy_from_host("key", "/root/.ssh/id_ed25519")
       client.succeed("chmod 600 /root/.ssh/id_ed25519")
 
       # Install the SSH key on the server.
-      server.succeed("mkdir -m 700 /root/.ssh")
       server.copy_from_host("key.pub", "/root/.ssh/authorized_keys")
       server.wait_for_unit("sshd")
       server.wait_for_unit("multi-user.target")