Add upgrade script

.env.example

@@ -1,7 +1,24 @@
 MAINNET_RPC=
-MAINNET_DEPLOYER_NAME=
 
 SEPOLIA_RPC=
-SEPOLIA_DEPLOYER_NAME=
+
+BASE_RPC=
+ARBITRUM_RPC=
+GNOSIS_RPC=
+CELO_RPC=
+OPTIMISM_RPC=
+POLYGON_RPC=
+
+# required: private key for deployer / Forge scripts
+PRIVATE_KEY=
+
+# For upgrade:submit-to-safe (proposer must be a Safe owner)
+SAFE_ADDRESS=
+PROXY_ADMIN_ADDRESS=
+PROXY_ADDRESS=
+NEW_IMPLEMENTATION_ADDRESS=
+PROPOSER_PRIVATE_KEY=
+# required: get at https://developer.safe.global
+SAFE_API_KEY=
 
 ETHERSCAN_API_KEY=

.gitignore

@@ -10,6 +10,8 @@ out-via-ir
 
 # Config files
 .env
+.env.local
+upgrade-payload.json
 
 # Avoid ignoring gitkeep
 !/**/.gitkeep