Removes the push command and the Atlas post-processor. Please see our
guide on building immutable infrastructure with Packer on CI/CD for
ideas on implementing these features yourself.
https://www.packer.io/guides/packer-on-cicd/
When using multiple builders, the post-processor could yield different results for the `{{timestamp}}` interpolation.
By using a variable instead, the version will be consistent across all builders.
https://github.com/hashicorp/packer/issues/4973
Matthew Hooker
Brian Cain
Justin Campbell
Seth Vargo
Chris Bednarski