env var jito tip

rust/chains/hyperlane-sealevel/src/mailbox.rs

@@ -555,14 +555,18 @@ impl Mailbox for SealevelMailbox {
         // If we're using Jito, we need to send a tip to the Jito fee account.
         // Otherwise, we need to set the compute unit price.
         if self.use_jito() {
+            let tip: u64 = std::env::var("JITO_TIP_LAMPORTS")
+                .ok()
+                .and_then(|s| s.parse::<u64>().ok())
+                .unwrap_or(PROCESS_DESIRED_PRIORITIZATION_FEE_LAMPORTS_PER_TX);
             // The tip is a standalone transfer to a Jito fee account.
             // See https://github.com/jito-labs/mev-protos/blob/master/json_rpc/http.md#sendbundle.
             instructions.push(solana_sdk::system_instruction::transfer(
                 &payer.pubkey(),
                 // A random Jito fee account, taken from the getFeeAccount RPC response:
                 // https://github.com/jito-labs/mev-protos/blob/master/json_rpc/http.md#gettipaccounts
                 &solana_sdk::pubkey!("DfXygSm4jCyNCybVYYK6DwvWqjKee8pbDmJGcLWNDXjh"),
-                PROCESS_DESIRED_PRIORITIZATION_FEE_LAMPORTS_PER_TX,
+                tip,
             ));
         } else {
             instructions.push(ComputeBudgetInstruction::set_compute_unit_price(