Actually add the rubocop script

Author: petergoldstein

script/run_rubocop

@@ -0,0 +1,14 @@
+#!/bin/bash
+# This file was generated on 2022-01-10T22:24:10+00:00 from the rspec-dev repo.
+# DO NOT modify it by hand as your changes will get lost the next time it is generated.
+
+set -e
+source script/functions.sh
+
+# Allow repos to override the default functions and add their own
+if [ -f script/custom_build_functions.sh ]; then
+  source script/custom_build_functions.sh
+fi
+
+
+fold "rubocop" check_style_and_lint