add script to test signing and claiming rewards

script/RewardsSig.s.sol

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: BSD-3-Clause-Clear
+
+pragma solidity 0.8.23;
+
+import {Script, console} from "forge-std/Script.sol";
+
+import {Rewards} from "../src/Rewards.sol";
+
+contract RewardsSig is Script {
+    uint256 internal sk;
+    address internal tgtAddr;
+    uint256 internal tgtAmount;
+    address internal rewardsAddr;
+
+    function setUp() public {
+        sk = vm.envUint("N_REWARDS_SIGNER");
+        tgtAddr = vm.envAddress("N_REWARDS_TGT_ADDR");
+        tgtAmount = vm.envUint("N_REWARDS_TGT_AMOUNT");
+        rewardsAddr = vm.envAddress("N_REWARDS_ADDR");
+    }
+
+    function run() public {
+        Rewards rewards = Rewards(rewardsAddr);
+
+        uint256 tgtSequence = rewards.sequences(tgtAddr);
+        console.log("=== Target sequence ===");
+        console.logUint(tgtSequence);
+
+        Rewards.Reward memory reward = Rewards.Reward({recipient: tgtAddr, amount: tgtAmount, sequence: tgtSequence});
+
+        bytes32 digest = rewards.digestReward(reward);
+
+        console.log("=== Rewards digest ===");
+        console.logBytes32(digest);
+
+        (uint8 v, bytes32 r, bytes32 s) = vm.sign(sk, digest);
+        bytes memory sig = abi.encodePacked(r, s, v);
+
+        console.log("=== Signature ===");
+        console.logBytes(sig);
+
+        vm.startBroadcast();
+        rewards.mintReward(reward, sig);
+    }
+}