Let build_with_store_internal take a runtime parameter

This is required to allow the VSS `KVStore` to share a reference to the runtime.

The runtime option will be set `Some` by `Node::start`.

src/builder.rs

@@ -163,12 +163,14 @@ impl Builder {
  let entropy_source_config = self.entropy_source_config.read().unwrap();
  let chain_data_source_config = self.chain_data_source_config.read().unwrap();
  let gossip_source_config = self.gossip_source_config.read().unwrap();
+ let runtime = Arc::new(RwLock::new(None));
  Arc::new(build_with_store_internal(
  config,
  entropy_source_config.as_ref(),
  chain_data_source_config.as_ref(),
  gossip_source_config.as_ref(),
  kv_store,
+ runtime,
  ))
  }
 }
@@ -178,6 +180,7 @@ fn build_with_store_internal<'a, K: KVStore + Sync + Send + 'static>(
  config: Arc<Config>, entropy_source_config: Option<&'a EntropySourceConfig>,
  chain_data_source_config: Option<&'a ChainDataSourceConfig>,
  gossip_source_config: Option<&'a GossipSourceConfig>, kv_store: Arc<K>,
+ runtime: Arc<RwLock<Option<tokio::runtime::Runtime>>>,
 ) -> Node<K> {
  let ldk_data_dir = format!("{}/ldk", config.storage_dir_path);
  fs::create_dir_all(ldk_data_dir.clone()).expect("Failed to create LDK data directory");
@@ -247,7 +250,6 @@ fn build_with_store_internal<'a, K: KVStore + Sync + Send + 'static>(
  }
  };
 
- let runtime = Arc::new(RwLock::new(None));
  let wallet =
  Arc::new(Wallet::new(blockchain, bdk_wallet, Arc::clone(&runtime), Arc::clone(&logger)));