Manifest: skip build if "skip build" label is set

manifest-pipeline.yml

@@ -23,6 +23,9 @@ workflow:
     # Do not run pipelines on integration branches
     - if: $CI_COMMIT_REF_NAME =~ /^integrate\/.*/
       when: never
+    # Do not run pipeline if the "skip build" label is set on the merge request
+    - if: $CI_MERGE_REQUEST_LABELS =~ /skip build/
+      when: never
     # Run pipelines for merge requests
     - if: $CI_MERGE_REQUEST_IID
     # Run pipelines on the master branch