fix(sidecar): sent local blob also to the mempool

bolt-sidecar/src/builder/payload_builder.rs

@@ -191,6 +191,21 @@ impl FallbackPayloadBuilder {
             withdrawals: Some(Withdrawals::new(withdrawals)),
         };
 
+        // If there are some blob transactions, send them to the mempool
+        let blob_txs = transactions.iter().filter(|tx| tx.as_eip4844().is_some());
+        for tx in blob_txs {
+            tracing::debug!(?tx.hash, "Sending blob tx to mempool");
+            let mut bytes: Vec<u8> = Vec::new();
+            tx.encode_enveloped(&mut bytes);
+            if let Err(e) = self
+                .execution_rpc_client
+                .send_raw_transaction(bytes.into())
+                .await
+            {
+                tracing::error!(error = ?e, ?tx.hash, "Failed to send blob tx to mempool");
+            }
+        }
+
         let mut hints = Hints::default();
         let max_iterations = 20;
         let mut i = 0;