Do not rename the file if it doesn't have a timestamp
Do not rename the file if it doesn't have a timestamp

- Linux doesn't let you rename files to the same name

Co-authored-by: Guillermo Kardolus <f995e5708409e0468f92322e706c77752cc6c0d4@pivotal.io>

cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci