chore: fix packages used in images

flake.nix

@@ -30,6 +30,14 @@
           lib' = import ./lib.nix {
             inherit pkgs;
           };
+          # The system the images will use packages from. There is no point in
+          # making the image using Darwin packages!
+          system' = builtins.replaceStrings ["darwin"] ["linux"] system;
+          pkgs' = import nixpkgs {
+            system = system';
+            config.allowUnfree = true;
+            lib = lib';
+          };
         in
         {
           _module.args = {
@@ -41,11 +49,10 @@
           };
           packages =
             let
-              inherit (pkgs) callPackage;
+              inherit (pkgs') callPackage;
               name = n: "src.thehellings.com/greg/${n}";
             in
             {
-              base = lib'.baseImage pkgs;
               bitwarden = callPackage ./img/bitwarden.nix { inherit name; };
               builder = callPackage ./img/builder.nix { inherit name lib'; };
               immich = callPackage ./img/immich.nix { inherit name; };