callisto: use pre-compiled vesktop to avoid long updates

hosts/callisto/configuration.nix

@@ -50,7 +50,47 @@
             ./0001-linux-dmabuf-allow-on-split-node-systems.patch
           ];
       });
-      vesktop = stablepkgs.vesktop;
+
+      vesktop = with pkgs; let
+        pname = "vesktop";
+        version = "1.5.3";
+
+        src = fetchurl {
+          url = "https://github.com/Vencord/Vesktop/releases/download/v${version}/${pname}-${version}-arm64.AppImage";
+          hash = "sha256-4F1oR2nc54EZ2heGVkz4vqZzmwn0exa2+AcYHpeTb98=";
+        };
+
+        appimageContents = appimageTools.extract {
+          inherit pname version src;
+        };
+
+        desktopItem = makeDesktopItem {
+          name = pname;
+          desktopName = "Vesktop";
+          exec = "vesktop %U --ozone-platform-hint=wayland --enable-features=WaylandWindowDecorations --enable-wayland-ime";
+          icon = "vesktop";
+          startupWMClass = "Vesktop";
+          genericName = "Internet Messenger";
+          keywords = [
+            "discord"
+          ];
+          categories = [
+            "Network"
+            "InstantMessaging"
+            "Chat"
+          ];
+        };
+      in
+        appimageTools.wrapType2 {
+          inherit pname version src;
+
+          extraInstallCommands = ''
+            mkdir -p $out/share
+            cp -rt $out/share ${desktopItem}/share/applications ${appimageContents}/usr/share/icons
+            chmod -R +w $out/share
+            mv $out/share/icons/hicolor/{16x16,256x256}
+          '';
+        };
     })
   ];