chore: add msyds ssh key to lain

users/lain/default.nix

@@ -31,6 +31,7 @@
       ../../public-keys/ssh/crumble-at-fruitbook.pub
       ../../public-keys/ssh/crumb-at-nixos-testbed.pub
       ../../public-keys/ssh/termux.pub
+      ../../public-keys/ssh/${"msyds@sydpc.pub"}
       ../../public-keys/ssh/windows.pub
     ];
   };