feat(homelab): add more aliases, setup ssh keys on yubikey

nix/users/luca/home.nix

@@ -23,6 +23,27 @@
     nodejs_22
     pnpm
   ];
+  systemd.user.services.ssh-add-keys = {
+    Unit = {
+      Description = "Load SSH keys from YubiKey";
+      After = [ "ssh-agent.service" ];
+      Requires = [ "ssh-agent.service" ];
+    };
+    Service = {
+      Type = "oneshot";
+      Environment = [
+        "SSH_AUTH_SOCK=%t/ssh-agent"
+        "SSH_ASKPASS=${pkgs.lxqt.lxqt-openssh-askpass}/bin/lxqt-openssh-askpass"
+        "SSH_ASKPASS_REQUIRE=prefer"
+        "DISPLAY=:0"
+      ];
+      ExecStart = "${pkgs.openssh}/bin/ssh-add -K";
+      RemainAfterExit = true;
+    };
+    Install = {
+      WantedBy = [ "default.target" ];
+    };
+  };
 
   home.stateVersion = "24.11";