fix: system build fixes for new package setup

hosts/default.nix

@@ -15,11 +15,17 @@ let
     }:
     let
       inherit (metadata.hosts.${name}) system;
+      pkgs' = top.self.packages.${system};
     in
     channel.lib.nixosSystem {
       pkgs = nixpkgs.${system};
       specialArgs = {
-        inherit metadata top lib';
+        inherit
+          metadata
+          top
+          lib'
+          pkgs'
+          ;
       };
       modules = [
         {

hosts/unstable/genesis/default.nix

@@ -2,7 +2,12 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
-{ top, pkgs, ... }:
+{
+  top,
+  pkgs,
+  pkgs',
+  ...
+}:
 {
   imports = [
     # Include the results of the hardware scan.
@@ -31,7 +36,7 @@
   };
 
   environment.systemPackages = with pkgs; [
-    create_ssl
+    pkgs'.create_ssl
     step-ca
   ];
 

hosts/unstable/linode/postgres.nix

@@ -1,7 +1,12 @@
-{ config, pkgs, ... }:
+{
+  config,
+  pkgs,
+  pkgs',
+  ...
+}:
 
 {
-  environment.systemPackages = [ pkgs.upgrade-pg-cluster ];
+  environment.systemPackages = [ pkgs'.upgrade-pg-cluster ];
 
   services.postgresql = {
     enable = true;