get postgres connection string from environment variable

database/postgres.ts

@@ -8,10 +8,10 @@ import type {
   MessageEntity,
 } from "./common.ts";
 import type { CommittedMessage } from "../types";
+import { env } from "../server/env.js";
 
 export const pool = new Pool({
-  connectionString:
-    "postgres://neondb_owner:npg_sOVmj8vWq2zG@ep-withered-king-adiz9gpi-pooler.c-2.us-east-1.aws.neon.tech:5432/neondb?sslmode=require&channel_binding=true",
+  connectionString: env.POSTGRES_CONNECTION_STRING as string,
   // channelBinding: require ?
 });