Before that change, the colors.css file was automatically fetched in the pipeline. While this works for Translucent's styleguide, the Python package build was missing the file.
This is due to the fact, that the colors.css file was ignored in Git and
the Python package tools won't copy any ignored SCM files when using
include_package_data. This happens automagically and can't be disabled
or alike.
Thus, with this change, the CD colors have to be updated on-demand, rather then automatically.