Use overlay

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/elara/configs/ssh/default.nix

@@ -1,13 +1,10 @@
 {
   config,
   inputs,
-  system,
   lib,
+  pkgs,
   ...
 }:
-let
-  selfPkgs = inputs.self.packages.${system};
-in
 {
   sops.secrets = {
     "ssh/personal/key" = {
@@ -45,10 +42,7 @@ in
     '';
 
     knownHostsFiles =
-      with selfPkgs;
-      (
-        [ ssh-known-hosts-github ]
-        ++ lib.lists.optionals config.sas.build.private [ ssh-known-hosts-sas-gitlab ]
-      );
+      with pkgs.sshKnownHosts;
+      ([ github ] ++ lib.lists.optionals config.sas.build.private [ sas-gitlab ]);
   };
 }