fix(release): harden beta publish workflow

scripts/install-ffmpeg-static.mjs

@@ -0,0 +1,32 @@
+import { spawnSync } from "node:child_process";
+
+const maxAttempts = Number.parseInt(process.env.FFMPEG_STATIC_INSTALL_ATTEMPTS ?? "3", 10);
+const baseDelayMs = Number.parseInt(process.env.FFMPEG_STATIC_INSTALL_DELAY_MS ?? "2000", 10);
+
+function sleep(ms) {
+	return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+async function main() {
+	for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
+		const result = spawnSync(process.execPath, ["node_modules/ffmpeg-static/install.js"], {
+			stdio: "inherit",
+		});
+
+		if (result.status === 0) {
+			return;
+		}
+
+		if (attempt === maxAttempts) {
+			process.exit(result.status ?? 1);
+		}
+
+		const delayMs = baseDelayMs * attempt;
+		console.warn(
+			`[ffmpeg-static] Install attempt ${attempt}/${maxAttempts} failed; retrying in ${delayMs}ms...`,
+		);
+		await sleep(delayMs);
+	}
+}
+
+await main();