feat: make fprint-grosshack a package and cleanup custom package referencing

nixos/overlays/list.nix

@@ -4,5 +4,17 @@
   nixpkgs.overlays = [
     (import ./swayosd.nix)
     (import ./blueberry.nix)
+
+    (final: prev: {
+      tutanota = final.callPackage ./pkgs/tutanota.nix {};
+    })
+
+    (final: prev: {
+      pam-fprint-grosshack = final.callPackage ./pkgs/pam-fprint-grosshack.nix {};
+    })
+
+    (final: prev: {
+      dracula-plymouth = final.callPackage ./pkgs/dracula-plymouth.nix {};
+    })
   ];
 }

nixos/overlays/pkgs/pam-fprint-grosshack.nix

@@ -0,0 +1,46 @@
+{ lib
+, stdenv
+, meson
+, ninja
+, pkg-config
+, glib
+, libfprint
+, polkit
+, dbus
+, systemd
+, pam
+, libpam-wrapper
+, fetchFromGitLab
+}:
+
+stdenv.mkDerivation rec {
+  pname = "pam-fprint-grosshack";
+  version = "v0.3.0";
+
+  src = fetchFromGitLab {
+    owner = "mishakmak";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-obczZbf/oH4xGaVvp3y3ZyDdYhZnxlCWvL0irgEYIi0=";
+  };
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+    glib
+    libfprint
+    polkit
+    dbus
+    systemd
+    pam
+    libpam-wrapper
+  ];
+  
+  mesonFlags = [
+    "-Dpam_modules_dir=${placeholder "out"}/lib/security"
+    "-Dsysconfdir=${placeholder "out"}/etc"
+    "-Ddbus_service_dir=${placeholder "out"}/share/dbus-1/system-services"
+    "-Dsystemd_system_unit_dir=${placeholder "out"}/lib/systemd/system"
+  ];
+}