give the openai lib a dummy default value to try to fix the build

pnpm-lock.yaml

@@ -1,4 +1,4 @@
-lockfileVersion: '6.0'
+lockfileVersion: '6.1'
 
 settings:
   autoInstallPeers: true

src/server/utils/openai.ts

@@ -2,4 +2,4 @@ import { env } from "~/env.mjs";
 
 import OpenAI from "openai";
 
-export const openai = new OpenAI({ apiKey: env.OPENAI_API_KEY });
+export const openai = new OpenAI({ apiKey: env.OPENAI_API_KEY ?? "" });