progrium/dokku — pull request #228 by pnegahdar (2013-09-27 13:18:29+00:00)
Title: Quick rebuild

This is a sample solution to close #225, basically unless a $DOCKER_FORCE_BUILD is set to something it uses the last revision of that apps image (if it exists) to run the /build/builder on. In the case of python (which I've tested) it uses the existing python environment and only installs the new required packages on later commits.