Fix gqlgen (#1105)

scripts/test_is_generated_code_in_sync.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+set -eu
+
+cd $(dirname $0)/../api
+go generate ./...
+if [ "$(git status -s 2>/dev/null | head -1)" != "" ]; then
+  echo '--- FAIL: The generated API code is out of sync with the recent changes. Please run `go generate ./...` under `./api` to regenerate it and commit it to this branch.'
+  exit 1
+fi
+
+echo '--- PASS: All generated code is in sync with the project.'