fix: the image lost after exporting (#3150)

Co-authored-by: Alex Yang <himself65@outlook.com>

packages/env/src/global.ts

@@ -63,6 +63,8 @@ export const buildFlagsSchema = z.object({
   enableBroadcastChannelProvider: z.boolean(),
   enableDebugPage: z.boolean(),
   changelogUrl: z.string(),
+  // see: packages/workers
+  imageProxyUrl: z.string(),
   enablePreloading: z.boolean(),
   enableNewSettingModal: z.boolean(),
   enableNewSettingUnstableApi: z.boolean(),