fix: fence concurrent ZIP archive builds

src/worker/mod.rs

@@ -2026,6 +2026,7 @@ mod tests {
         let state = AppState {
             mailer: Arc::new(Mailer::new(&config).expect("create disabled test mailer")),
             image_processing_semaphore: Arc::new(Semaphore::new(2)),
+            zip_build_semaphore: Arc::new(Semaphore::new(2)),
             runtime_policy_cache: crate::services::settings::RuntimePolicyCache::new(),
             storage_cache: storage::StorageCache::new(),
             config,