refactor: use overlays for my custom packages

nixFastChecks/apps/default.nix

@@ -1,10 +1,7 @@
-{
-  pkgs,
-  self,
-}: let
+pkgs: let
   inherit (pkgs.lib) mapAttrs' nameValuePair;
 in
   mapAttrs'
   (name: app:
     nameValuePair "app_${name}" app)
-  self.appsPackages.${pkgs.system}
+  pkgs.appsPackages

nixFastChecks/default.nix

@@ -7,10 +7,10 @@
 }: let
   inherit (self.lib.attrs) recursiveUpdateList;
 
-  apps = perSystem (pkgs: import ./apps {inherit pkgs self;});
+  apps = perSystem (import ./apps);
   devices = perSystem (pkgs: import ./devices {inherit pkgs self;});
   devShells = perSystem (pkgs: import ./devShells {inherit pkgs self;});
-  packages = perSystem (pkgs: import ./packages {inherit pkgs self;});
+  packages = perSystem (import ./packages);
 in {
   inherit apps devices devShells packages;
 

nixFastChecks/packages/default.nix

@@ -1,7 +1,4 @@
-{
-  pkgs,
-  self,
-}: let
+pkgs: let
   inherit (pkgs.lib) elem filterAttrs hasAttr mapAttrs' nameValuePair;
 
   packages =
@@ -10,7 +7,7 @@
         !(hasAttr "platforms" v.meta)
         || elem pkgs.system v.meta.platforms
     )
-    self.packages.${pkgs.system};
+    pkgs.selfPackages;
 in
   mapAttrs'
   (name: pkg: