Revert "update dockerfile to be based on cflinuxfs3"
Revert "update dockerfile to be based on cflinuxfs3"

This reverts commit 099e5b7660600a838aa8ef113702df9f4390f951.

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