Adding nudge configuration (#803)

Author: OlivierCazade

.tekton/flowlogs-pipeline-1-8-push.yaml

@@ -6,6 +6,7 @@ metadata:
     build.appstudio.redhat.com/commit_sha: '{{revision}}'
     build.appstudio.redhat.com/target_branch: '{{target_branch}}'
     pipelinesascode.tekton.dev/max-keep-runs: "3"
+    build.appstudio.openshift.io/build-nudge-files: "hack/container_digest.sh"
     pipelinesascode.tekton.dev/on-cel-expression: event == "push" && target_branch
       == "release-1.8"
   creationTimestamp: null