Add configmap permissions to getting started RBAC
Add configmap permissions to getting started RBAC

It looks like these are required after https://github.com/tektoncd/triggers/commit/d2042e3e99e31a2a4df26be5986495be5757e7fd It looks like that PR _did_ update some example config, so I wonder if:
1) there is some duplication in the examples that can be removed
2) if the getting started stuff could be tested

(bonus if you get this wrong before you start the event listener, it puts the event listener in a bad and confusing state even after you fix it!  yaaaay)
tektoncd/triggers,tektoncd/triggers