Extend number of work threads to 8

src/anbox/runtime.h

@@ -35,7 +35,7 @@ class Runtime : public DoNotCopyOrMove,
                 public std::enable_shared_from_this<Runtime> {
 public:
     // Our default concurrency setup.
-    static constexpr const std::uint32_t worker_threads = 2;
+    static constexpr const std::uint32_t worker_threads = 8;
 
     // create returns a Runtime instance with pool_size worker threads
     // executing the underlying service.