tweak(frontend): Add msg for custom error (#8157)

add waitlist msg

autogpt_platform/frontend/src/app/login/actions.ts

@@ -50,6 +50,9 @@ export async function signup(values: z.infer<typeof loginFormSchema>) {
       const { data, error } = await supabase.auth.signUp(values);
 
       if (error) {
+        if (error.message.includes("P0001")) {
+          return "Please join our waitlist for your turn: https://agpt.co/waitlist";
+        }
         return error.message;
       }