automatic overlay for ./packages directory

also gamescope added system-wide and in flatpak for steam

packages/fluxer-canary.nix

@@ -0,0 +1,38 @@
+{
+  appimageTools,
+  fetchurl,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  pname = "fluxer-canary";
+  version = "2026.602.31138";
+
+  src = fetchurl {
+    url = "https://api.canary.fluxer.app/dl/desktop/canary/linux/x64/latest/appimage";
+    sha256 = "sha256-d4FAWwrWyoyp7lo8X+nIe+Dd6Z8rDThyK1wU00f7rjY=";
+  };
+
+  appimageContents = appimageTools.extract { inherit pname version src; };
+in
+appimageTools.wrapType2 rec {
+  inherit pname version src;
+
+  extraInstallCommands = ''
+    install -m 444 -D ${appimageContents}/${pname}.desktop $out/share/applications/${pname}.desktop
+
+    install -m 444 -D ${appimageContents}/${pname}.png $out/share/icons/hicolor/512x512/apps/${pname}.png
+
+    substituteInPlace $out/share/applications/${pname}.desktop \
+      --replace 'Exec=AppRun %U' 'Exec=${pname} %U'
+  '';
+
+  meta = with lib; {
+    description = "Open-source, self-hosted alternative to Discord";
+    homepage = "https://fluxer.app/";
+    license = licenses.agpl3Only;
+    maintainers = [ ];
+    platforms = [ "x86_64-linux" ];
+  };
+}