feat: add example upgrade script

contracts/script/ExampleUpgrade.s.sol

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+import {Script} from "forge-std/Script.sol";
+import {console2} from "forge-std/Test.sol";
+import {UpgradeableProxyLib} from "./utils/UpgradeableProxyLib.sol";
+import {HelloWorldDeploymentLib} from "./utils/HelloWorldDeploymentLib.sol";
+import {CoreDeploymentLib} from "./utils/CoreDeploymentLib.sol";
+import {ECDSAStakeRegistry} from "@eigenlayer-middleware/src/unaudited/ECDSAStakeRegistry.sol";
+import {HelloWorldServiceManager} from "../src/HelloWorldServiceManager.sol";
+import {IDelegationManager} from "@eigenlayer/contracts/interfaces/IDelegationManager.sol";
+
+contract ExampleUpgrade is Script {
+    using UpgradeableProxyLib for address;
+    using CoreDeploymentLib for *;
+
+    address private deployer;
+    address proxyAdmin;
+    HelloWorldDeploymentLib.DeploymentData helloWorldDeployment;
+    CoreDeploymentLib.DeploymentData coreDeployment;
+
+    function setUp() public virtual {
+        deployer = vm.rememberKey(vm.envUint("PRIVATE_KEY"));
+        vm.label(deployer, "Deployer");
+
+        // Read existing deployments
+        coreDeployment = CoreDeploymentLib.readDeploymentJson("deployments/core/", block.chainid);
+        helloWorldDeployment = HelloWorldDeploymentLib.readDeploymentJson(block.chainid);
+        proxyAdmin = helloWorldDeployment.proxyAdmin;
+    }
+
+    function run() external {
+        vm.startBroadcast(deployer);
+
+        /// Deploy new implementation contracts
+        address newStakeRegistryImpl = address(
+            new ECDSAStakeRegistry(IDelegationManager(coreDeployment.delegationManager))
+        );
+
+        address newHelloWorldServiceManagerImpl = address(
+            new HelloWorldServiceManager(
+                coreDeployment.avsDirectory,
+                helloWorldDeployment.stakeRegistry,
+                coreDeployment.rewardsCoordinator,
+                coreDeployment.delegationManager
+            )
+        );
+
+        /// This is where you will actually perform your upgrade
+        helloWorldDeployment.helloWorldServiceManager.upgrade(newHelloWorldServiceManagerImpl);
+        helloWorldDeployment.stakeRegistry.upgrade(newStakeRegistryImpl);
+
+        vm.stopBroadcast();
+
+        verifyUpgrade();
+        HelloWorldDeploymentLib.writeDeploymentJson(helloWorldDeployment);
+    }
+
+    function verifyUpgrade() internal view {
+        require(
+            helloWorldDeployment.helloWorldServiceManager.getImplementation() != address(0),
+            "HelloWorldServiceManager implementation cannot be zero"
+        );
+        require(
+            helloWorldDeployment.stakeRegistry.getImplementation() != address(0),
+            "StakeRegistry implementation cannot be zero"
+        );
+    }
+}