Use overlay

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

flake.nix

@@ -113,14 +113,14 @@
   };
 
   outputs =
-    inputs:
+    unpatchedInputs:
     let
-      mkInputs =
+      patchInputs =
         system:
         let
-          patcher = inputs.flake-input-patcher.lib.${system};
+          patcher = unpatchedInputs.flake-input-patcher.lib.${system};
         in
-        patcher.patch inputs (import ./patches.nix { inherit patcher; });
+        patcher.patch unpatchedInputs (import ./patches.nix { inherit patcher; });
 
       mkNixosConfiguration =
         inputs: system: modules:
@@ -129,14 +129,21 @@
           specialArgs = { inherit inputs system; };
         };
     in
-    (
+    {
+      overlays.default = import ./overlays;
+    }
+    // (
       let
         system = "x86_64-linux";
-        inputs = mkInputs system;
+        inputs = patchInputs system;
 
         pkgs = import inputs.nixpkgs {
           inherit system;
           config.allowUnfree = true;
+          overlays = [
+            inputs.lib.overlays.default
+            inputs.self.overlays.default
+          ];
         };
 
         treefmt = inputs.treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
@@ -151,8 +158,7 @@
         };
 
         devShells.${system} = import ./hosts/common/shells { inherit pkgs; };
-        packages.${system} = import ./packages { inherit pkgs inputs system; };
-
+        packages.${system} = import ./packages { inherit pkgs; };
         formatter.${system} = treefmt.config.build.wrapper;
         checks.${system}.formatting = treefmt.config.build.check inputs.self;
       }