In package alpine-baselayout in file /etc/profile scripts load by mask /etc/profile.d/*.sh, but already exists file /etc/profile.d/color_prompt not load.

Probably solution: change in /etc/profile line

for script in /etc/profile.d/*.sh ; do

to

for script in /etc/profile.d/* ; do

or rename file

/etc/profile.d/color_prompt

to

/etc/profile.d/color_prompt.sh

(from redmine: issue id 6933, created on 2017-02-25)