chore: Add a diff helper (#1111)

* chore: Add a diff helper

* chore: Ignore state files

Author: janjakubnanista

.circleci/config.yml

@@ -193,6 +193,9 @@ jobs:
               echo "go run ./cmd/codegen \\"
               echo "  --l1-rpc-urls=\"<urls>\" \\"
               echo "  --superchains=\"$SUPERCHAINS\""
+              echo ""
+              echo "These are the expected changes:"
+              git diff
               exit 1
             else
               echo "\n✅ All codegen files are up to date"

.gitignore

@@ -10,6 +10,9 @@ superchain/**/testchain*
 /broadcast/*/31337/
 /broadcast/**/dry-run/
 
+# State files
+/*-state.json
+
 # vim
 *.sw*m