refactor: add flake module for pkgs/

pkgs/default.nix

@@ -1,6 +0,0 @@
-{ pkgs, ... }:
-
-{
-  brlaser = pkgs.callPackage ./brlaser { };
-  deconz = pkgs.qt5.callPackage ./deconz { };
-}

pkgs/flake-module.nix

@@ -0,0 +1,12 @@
+_: {
+  perSystem = { inputs, self', pkgs, ... }: {
+    packages = {
+      brlaser = pkgs.callPackage ./brlaser { };
+      deconz = pkgs.qt5.callPackage ./deconz { };
+    };
+
+    apps = {
+      deconz = inputs.flake-utils.lib.mkApp { drv = self'.packages.deconz; };
+    };
+  };
+}