Make fee token configurable

cairo/crates/contracts/Scarb.toml

@@ -29,5 +29,9 @@ casm = true
 casm-add-pythonic-hints = true
 build-external-contracts = ["mocks::*"]
 
+[scripts]
+starknet = "FEE_TOKEN=0x04718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d ./feeToken.sh"
+paradex = "FEE_TOKEN=0x7348407ebad690fec0cc8597e87dc16ef7b269a655ff72587dafff83d462be2 ./feeToken.sh"
+
 [lib]
 name = "contracts"

cairo/crates/contracts/feeToken.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+FILEPATH="src/fee_token.cairo"
+TEMPFILE=$(mktemp)
+
+# writes all but the last 2 lines to the temp file
+head -n $(($(wc -l < $FILEPATH) - 2)) $FILEPATH > $TEMPFILE
+
+# writes generated last 2 lines to the temp file
+cat <<EOF >> $TEMPFILE
+    $FEE_TOKEN.try_into().unwrap()
+}
+EOF
+
+# overwrite the original file with the temp file
+cat $TEMPFILE > $FILEPATH

cairo/crates/contracts/src/fee_token.cairo

@@ -0,0 +1,6 @@
+use starknet::ContractAddress;
+
+pub fn FEE_TOKEN() -> ContractAddress {
+    // GENERATED CODE - DO NOT EDIT
+    0x04718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d.try_into().unwrap()
+}

cairo/crates/contracts/src/interfaces.cairo

@@ -1,12 +1,13 @@
 use alexandria_bytes::Bytes;
+use contracts::fee_token::FEE_TOKEN;
 use contracts::hooks::merkle_tree_hook::merkle_tree_hook::Tree;
 use contracts::libs::message::Message;
 use core::array::ArrayTrait;
 use starknet::ContractAddress;
 use starknet::EthAddress;
 
 pub fn ETH_ADDRESS() -> ContractAddress {
-    0x049D36570D4e46f48e99674bd3fcc84644DdD6b96F7C741B1562B82f9e004dC7.try_into().unwrap()
+    FEE_TOKEN()
 }
 
 #[derive(Serde, Drop, Debug, PartialEq)]

cairo/crates/contracts/src/lib.cairo

@@ -1,3 +1,4 @@
+pub mod fee_token;
 pub mod interfaces;
 pub mod mailbox;
 pub mod libs {