feat(electron): add script to manage temporary directory for Electron Forge builds

scripts/electron-forge-local-tmp.js

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+// Staging must live outside the repo: packager copies the project into TMPDIR, which cannot be under the source tree.
+
+const { spawnSync } = require("child_process");
+const fs = require("fs");
+const path = require("path");
+
+const root = path.join(__dirname, "..");
+const defaultTmpDir = path.join(path.dirname(root), `.forge-tmp-${path.basename(root)}`);
+const tmpDir = path.resolve(process.env.FORGE_TMPDIR || defaultTmpDir);
+fs.mkdirSync(tmpDir, { recursive: true });
+
+const env = {
+    ...process.env,
+    TMPDIR: tmpDir,
+    TEMP: tmpDir,
+    TMP: tmpDir,
+};
+
+const forgeCli = require.resolve("@electron-forge/cli/dist/electron-forge.js");
+const args = process.argv.slice(2);
+const result = spawnSync(process.execPath, [forgeCli, ...args], {
+    cwd: root,
+    env,
+    stdio: "inherit",
+});
+
+if (result.signal) {
+    process.exit(1);
+}
+process.exit(result.status ?? 1);