Commits on May 26, 2022

1. container_push: add doc about no transaction …

   When use container_push with skip_unchanged_digest,
   user often rely on the push process to (1) check for existence
   of the image in the registry and (2) push the image if (1) is false.
   
   This leave a time window between (1) and (2) where the image
   could have been pushed by an external process such as another CI
   job running in parallel. In such situation, depends on the container
   registry configuration, the push arrive later can either fail for attempting
   to override an already pushed image, or it will override the previously
   pushed image.
   
   There is no transactional guarantee that can help coordinate (1) and (2) in
   the current container registry spec. So let's document this edge case and
   advise users to work around by using some external distributed lock for
   running container_push target.

   

   sluongng committed May 26, 2022
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