chore: don't run e2e-test for draft pr

Signed-off-by: Jing Qi <[email protected]>

.tekton/release-service-pull-request.yaml

@@ -7,7 +7,11 @@ metadata:
     build.appstudio.redhat.com/pull_request_number: '{{pull_request_number}}'
     build.appstudio.redhat.com/target_branch: '{{target_branch}}'
     pipelinesascode.tekton.dev/max-keep-runs: "3"
-    pipelinesascode.tekton.dev/on-cel-expression: event == "pull_request" && target_branch == "main"
+    pipelinesascode.tekton.dev/on-cel-expression: |
+      event == "pull_request"
+      && target_branch == "main"
+      && ( !has(body.pull_request) || !body.pull_request.draft)
+      && files.all.exists(x, !x.matches('^(?:.github)/|\\.md$|^(?:.*/)?(?:\\.gitignore|PROJECT|LICENSE|.sonarcloud.properties|.gitlint|.dockerignore)$'))
   creationTimestamp: null
   labels:
     appstudio.openshift.io/application: release-service