add forge script to add gnosis signer

packages/contracts-bedrock/scripts/AddSafeSigner.s.sol

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import { console } from "forge-std/console.sol";
+import { Script } from "forge-std/Script.sol";
+import { Safe, SignatureDecoder } from "safe-contracts/Safe.sol";
+import { Enum as SafeOps } from "safe-contracts/common/Enum.sol";
+
+contract AddSafeSigner is Script, SignatureDecoder {
+    Safe redstoneSafe = Safe(payable(0x70FdbCb066eD3621647Ddf61A1f40aaC6058Bc89));
+    address newSigner = address(0x7211399b320a0417286897fCeD1ee4ba1C1771d4);
+
+    /// @notice Make a call from the Safe contract to an arbitrary address with arbitrary data
+    function _callViaSafe(Safe _safe, address _target, bytes memory _data) internal {
+        // This is the signature format used the caller is also the signer.
+        bytes memory signature = abi.encodePacked(uint256(uint160(msg.sender)), bytes32(0), uint8(1));
+        uint8 v;
+        bytes32 r;
+        bytes32 s;
+        (v, r, s) = signatureSplit(signature, 0);
+        console.log(v);
+        console.logBytes32(r);
+        console.logBytes32(s);
+
+        _safe.execTransaction({
+            to: _target,
+            value: 0,
+            data: _data,
+            operation: SafeOps.Operation.Call,
+            safeTxGas: 0,
+            baseGas: 0,
+            gasPrice: 0,
+            gasToken: address(0),
+            refundReceiver: payable(address(0)),
+            signatures: signature
+        });
+    }
+
+    function run() public {
+        console.log(msg.sender);
+
+        vm.startBroadcast(msg.sender);
+        _callViaSafe(redstoneSafe, address(redstoneSafe), abi.encodeCall(redstoneSafe.addOwnerWithThreshold, (newSigner, 1)));
+        vm.stopBroadcast();
+
+        address[] memory owners = redstoneSafe.getOwners();
+        console.log("num owners", owners.length);
+        for(uint256 i; i<owners.length; i++) {
+            console.log("owner", owners[i]);
+        }
+        uint256 threshold = redstoneSafe.getThreshold();
+        console.log("threshold", threshold);
+
+        require(threshold == 1, "invalid threshold");
+        require(owners.length == 2, "invalid number of owners");
+        require(owners[0] == newSigner, "invalid new owner");
+        require(owners[1] == msg.sender, "invalid previous owner");
+    }
+}