poseidon: setup agenix secrets

hosts/poseidon/default.nix

@@ -12,6 +12,7 @@ in
       ./hardware-configuration.nix
 
       ./home.nix
+      ./secrets.nix
     ];
 
   # Use the GRUB 2 boot loader.

hosts/poseidon/secrets.nix

@@ -0,0 +1,16 @@
+{ config, lib, options, ... }:
+
+{
+  config.age = {
+    secrets =
+      let
+        toSecret = name: { ... }@attrs: {
+          file = ./../../modules/secrets + "/${name}.age";
+        } // attrs;
+      in
+        lib.mapAttrs toSecret {
+          "users/alarsyo-hashed-password" = {};
+          "users/root-hashed-password" = {};
+        };
+  };
+}