Add env var

Author: ericallam

apps/webapp/app/env.server.ts

@@ -1213,6 +1213,7 @@ const EnvironmentSchema = z
       .default("info"),
     REALTIME_STREAMS_S2_FLUSH_INTERVAL_MS: z.coerce.number().int().default(100),
     REALTIME_STREAMS_S2_MAX_RETRIES: z.coerce.number().int().default(10),
+    REALTIME_STREAMS_S2_WAIT_SECONDS: z.coerce.number().int().default(600),
   })
   .and(GithubAppEnvSchema);