feat: update base class to faciliate fetching envvars

src/release-template/2-multisig.s.sol

@@ -1,11 +1,7 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity ^0.8.12;
 
-import {
-    MultisigCall,
-    MultisigCallUtils,
-    OpsTimelockBuilder
-} from "../templates/OpsTimelockBuilder.sol";
+import {MultisigCall, MultisigCallUtils, OpsTimelockBuilder} from "../templates/OpsTimelockBuilder.sol";
 
 contract Queue is OpsTimelockBuilder {
     using MultisigCallUtils for MultisigCall[];

src/templates/EOADeployer.sol

@@ -1,13 +1,13 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity ^0.8.12;
 
-import {Script} from "forge-std/Script.sol";
+import {ZeusScript} from "../utils/ZeusScript.sol";
 
 /**
  * @title EOADeployer
  * @notice Template for an Externally Owned Account (EOA) deploy script.
  */
-abstract contract EOADeployer is Script {
+abstract contract EOADeployer is ZeusScript {
     /**
      * @notice Struct for deployment information.
      * @param deployedTo The address where the contract is deployed.

src/templates/MultisigBuilder.sol

@@ -1,17 +1,19 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity ^0.8.12;
 
-import {Script} from "forge-std/Script.sol";
+import {ZeusScript} from "../utils/ZeusScript.sol";
 import {MultisigCall, MultisigCallUtils} from "../utils/MultisigCallUtils.sol";
 import {SafeTx, EncGnosisSafe} from "../utils/SafeTxUtils.sol";
 
 /**
  * @title MultisigBuilder
  * @dev Abstract contract for building arbitrary multisig scripts.
  */
-abstract contract MultisigBuilder is Script {
+abstract contract MultisigBuilder is ZeusScript {
     using MultisigCallUtils for MultisigCall[];
 
+    string internal constant multiSendCallOnlyName = "MultiSendCallOnly";
+
     /**
      * @notice Constructs a SafeTx object for a Gnosis Safe to ingest.
      * @return A SafeTx struct containing the transaction data to post to the Safe API.
@@ -26,7 +28,8 @@ abstract contract MultisigBuilder is Script {
         // creates and return SafeTx object
         // assumes 0 value (ETH) being sent to multisig
 
-        address multiSendCallOnly = vm.envAddress("ZEUS_DEPLOYED_MultiSendCallOnly");
+        address multiSendCallOnly = zeusAddress(multiSendCallOnlyName);
+
         return SafeTx({to: multiSendCallOnly, value: 0, data: data, op: EncGnosisSafe.Operation.DelegateCall});
     }
 

src/utils/ZeusScript.sol

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.12;
+
+import {StringUtils} from "./StringUtils.sol";
+import {Script} from "forge-std/Script.sol";
+
+contract ZeusScript is Script {
+    using StringUtils for string;
+
+    string internal constant addressPrefix = "ZEUS_DEPLOYED_";
+
+    /**
+     * @notice Returns the address of a contract based on the provided key, querying the envvars injected by Zeus. This is typically the name of the contract.
+     * @param key The key to look up the address for. Should be the contract name, with an optional suffix if deploying multiple instances. (E.g. "MyContract_1" and "MyContract_2")
+     * @return The address of the contract associated with the provided key. Reverts if envvar not found.
+     */
+    function zeusAddress(string memory key) internal view returns (address) {
+        string memory envvar = addressPrefix.concat(key);
+        return vm.envAddress(envvar);
+    }
+}