Force IPv4 for knowledge-search indexer DB connections on GitHub Actions (#741)

* Initial plan

* fix: force IPv4 for knowledge search postgres connection

Agent-Logs-Url: https://github.com/z-shell/wiki/sessions/73a3cdf1-4f11-432c-b6bb-109fb76e7561

Co-authored-by: ss-o <59910950+ss-o@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ss-o <59910950+ss-o@users.noreply.github.com>

Author: Copilot

scripts/knowledge-search/embed-docs.mjs

@@ -24,7 +24,10 @@ export async function runIndexer(env = process.env) {
 
   const [{default: OpenAI}, {default: postgres}] = await Promise.all([import("openai"), import("postgres")]);
   const openai = new OpenAI({apiKey: env.OPENAI_API_KEY});
-  const sql = postgres(env.SUPABASE_DB_URL, {ssl: env.SUPABASE_DB_SSL === "disable" ? false : "require"});
+  const sql = postgres(env.SUPABASE_DB_URL, {
+    ssl: env.SUPABASE_DB_SSL === "disable" ? false : "require",
+    family: 4,
+  });
   let runId;
 
   try {