Process PR closed events from GitHub in Pipelines as Code 

Currently Piplelines as Code only processes Push and PR Open/Update webhooks, and wont pass on other pull request action types to the PipelineRun. There is no way to use CEL or another annotation type to capture and react to PR Close events.
This can be achieved with the older EventListener -> Trigger -> Interceptor pipeline workflow
        - params:
            - name: filter
              value: 'body.action in [''closed'']'
          ref:
            kind: ClusterInterceptor
            name: cel

 When testing a PR we build a copy of the app to validate it. When the PR is closed (with or without merge) we want to run a cleanup action to delete any PR specific objects that have been created. 

OpenShift Pipelines - PAC