ci: Add reusable retry script for CI commands (#26815)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

.github/scripts/retry.mjs

@@ -0,0 +1,60 @@
+#!/usr/bin/env node
+/**
+ * Retry a shell command with configurable attempts and delay.
+ *
+ * Usage: node retry.mjs [--attempts N] [--delay N] '<command>'
+ *
+ * Options:
+ *   --attempts N   Maximum number of attempts (default: 4)
+ *   --delay N      Seconds to wait between retries (default: 15)
+ *
+ * The command is executed via shell, so pipes and env-var expansion work.
+ * Exits 0 on first success, 1 if all attempts fail.
+ */
+import { execSync } from 'node:child_process';
+
+const args = process.argv.slice(2);
+
+function getFlag(name, defaultValue) {
+	const index = args.indexOf(`--${name}`);
+	if (index === -1 || !args[index + 1]) return defaultValue;
+	const value = parseInt(args[index + 1], 10);
+	if (Number.isNaN(value) || value <= 0) {
+		console.error(`Error: --${name} must be a positive integer`);
+		process.exit(1);
+	}
+	return value;
+}
+
+const attempts = getFlag('attempts', 4);
+const delay = getFlag('delay', 15);
+
+// Command is the last positional arg (skip flags and their values)
+const command = args
+	.filter((a, i) => {
+		if (a.startsWith('--')) return false;
+		if (i > 0 && args[i - 1].startsWith('--')) return false;
+		return true;
+	})
+	.pop();
+
+if (!command) {
+	console.error("Usage: node retry.mjs [--attempts N] [--delay N] '<command>'");
+	process.exit(1);
+}
+
+for (let i = 1; i <= attempts; i++) {
+	try {
+		execSync(command, { shell: true, stdio: 'inherit' });
+		process.exit(0);
+	} catch {
+		if (i < attempts) {
+			console.error(`Attempt ${i}/${attempts} failed, retrying in ${delay}s...`);
+			execSync(`sleep ${delay}`);
+		} else {
+			console.error(`Attempt ${i}/${attempts} failed, no more retries.`);
+		}
+	}
+}
+
+process.exit(1);