ci: retry spec fetch with backoff

A transient CDN 520 failed the sdk-typescript scheduled release on 2026-07-07; the same single-shot fetch lives here. Retry up to 5 times with exponential backoff so the daily release run survives upstream blips.

Author: ph33nx

scripts/generate.mjs

@@ -34,13 +34,27 @@ const TESTS_GENERATED_DIR = path.join(ROOT, 'tests', 'Generated');
 // 1. Fetch + patch + persist spec
 // ---------------------------------------------------------------------------
 
-console.log(`[generate] fetching ${SPEC_URL}`);
-const response = await fetch(SPEC_URL, { headers: { 'Cache-Control': 'no-cache' } });
-if (!response.ok) {
-	console.error(`[generate] fetch failed: ${response.status} ${response.statusText}`);
-	process.exit(1);
+/** Retry with exponential backoff: a transient upstream error (e.g. a CDN 520) must not fail the daily release run. */
+async function fetchSpec(url, attempts = 5) {
+	for (let attempt = 1; ; attempt++) {
+		try {
+			const res = await fetch(url, { headers: { 'Cache-Control': 'no-cache' } });
+			if (!res.ok) throw new Error(`HTTP ${res.status} ${res.statusText}`);
+			return await res.json();
+		} catch (err) {
+			if (attempt === attempts) {
+				console.error(`[generate] fetch failed after ${attempts} attempts: ${err.message}`);
+				process.exit(1);
+			}
+			const delay = 2 ** attempt;
+			console.warn(`[generate] fetch attempt ${attempt}/${attempts} failed (${err.message}), retrying in ${delay}s`);
+			await new Promise((resolve) => setTimeout(resolve, delay * 1000));
+		}
+	}
 }
-const spec = await response.json();
+
+console.log(`[generate] fetching ${SPEC_URL}`);
+const spec = await fetchSpec(SPEC_URL);
 
 // Patch server URL to absolute production URL so the connector works without
 // users supplying a baseUrl (matches the TS + Python SDKs).