proper fix for disabling sandbox on steamos

package.json

@@ -68,6 +68,7 @@
             "package.json",
             "LICENSE"
         ],
+        "afterPack": "scripts/build/fixSandbox.js",
         "linux": {
             "icon": "build/icon.icns",
             "category": "Network",

scripts/build/fixSandbox.js

@@ -0,0 +1,46 @@
+/*
+ * SPDX-License-Identifier: GPL-3.0
+ * Vesktop, a desktop app aiming to give you a snappier Discord Experience
+ * Copyright (c) 2023 Vendicated and Vencord contributors
+ */
+
+// Based on https://github.com/gergof/electron-builder-sandbox-fix/blob/master/lib/index.js
+
+const fs = require("fs/promises");
+const path = require("path");
+
+const log = (message, dotFormatting = chalk.blue) => {
+    console.log(`  ${dotFormatting("•")} ${message}`);
+};
+
+const afterPackHook = async params => {
+    if (process.platform !== "linux") {
+        // this fix is only required on linux
+        return;
+    }
+
+    const executable = path.join(params.appOutDir, params.packager.executableName);
+
+    const loaderScript = `#!/usr/bin/env bash
+SCRIPT_DIR="$( cd "$( dirname "\${BASH_SOURCE[0]}" )" && pwd )"
+IS_STEAMOS=0
+
+if [[ "$SteamOS" == "1" && "$SteamGamepadUI" == "1" ]]; then
+    echo "Running Vesktop on SteamOS, disabling sandbox"
+	IS_STEAMOS=1
+fi
+
+exec "$SCRIPT_DIR/${params.packager.executableName}.bin" "$([ "$IS_STEAMOS" == 1 ] && echo '--no-sandbox')" "$@"
+`;
+
+    try {
+        await fs.rename(executable, executable + ".bin");
+        await fs.writeFile(executable, loaderScript);
+        await fs.chmod(executable, 0o755);
+    } catch (e) {
+        console.error("failed to create loder for sandbox fix: " + e.message);
+        throw new Error("Failed to create loader for sandbox fix");
+    }
+};
+
+module.exports = afterPackHook;