Add instructions to upgrade TokenStaking

Ideally, this should be automated, but this is a start

deploy/60_validate_upgrade_token_staking.ts

@@ -1,3 +1,5 @@
+// See deploy/TokenStaking_upgrade_instructions.md
+
 import { HardhatRuntimeEnvironment } from "hardhat/types"
 import { DeployFunction } from "hardhat-deploy/types"
 

deploy/61_prepare_upgrade_token_staking.ts

@@ -1,3 +1,5 @@
+// See deploy/TokenStaking_upgrade_instructions.md
+
 import { HardhatRuntimeEnvironment } from "hardhat/types"
 import { DeployFunction } from "hardhat-deploy/types"
 

deploy/TokenStaking_upgrade_instructions.md

@@ -0,0 +1,41 @@
+# Instructions to upgrade TokenStaking
+Tested with:
+
+* hardhat: 2.19.1
+* @openzeppelin/hardhat-upgrades: 1.28.0
+* @nomicfoundation/hardhat-verify: 2.0.1
+
+## Summary
+
+### Setup
+
+git remote update
+git checkout <branch>
+
+export CHAIN_API_URL=<...>
+export CONTRACT_OWNER_ACCOUNT_PRIVATE_KEY=<...>
+export KEEP_CONTRACT_OWNER_ACCOUNT_PRIVATE_KEY=<...>
+export ETHERSCAN_API_KEY=<...>
+
+### Validate and deploy implementation contract
+
+yarn hardhat deploy --tags ValidateUpgradeTokenStaking --network mainnet
+yarn hardhat deploy --tags PrepareUpgradeTokenStaking --network mainnet
+
+This will modify this OZ manifest file:
+.openzeppelin/mainnet.json
+
+### Post-deployment stuff
+
+unset CONTRACT_OWNER_ACCOUNT_PRIVATE_KEY
+unset KEEP_CONTRACT_OWNER_ACCOUNT_PRIVATE_KEY
+
+cp TokenStaking_implementation_0x<IMPLEMENTATION_ADDRESS>.json deployments/mainnet/TokenStaking.json
+
+Edit deployments/mainnet/TokenStaking.json to keep proxy address instead of new implementation address
+
+### Contract verification
+
+Verify implementation contract using @nomicfoundation/hardhat-verify:
+
+yarn hardhat verify --network mainnet <CONTRACT_ADDRESS> <CONSTRUCTOR_PARAM_1> <CONSTRUCTOR_PARAM_2> ...