Set color.ui to avoid google git repo to ask for it

Dockerfile

@@ -63,5 +63,7 @@ USER ${USERNAME}
 WORKDIR /home/${USERNAME}
 
 # Setup git
+# Set color.ui to avoid google git repo to prompt for it
 RUN git config --global user.name ${USERNAME} \
-  && git config --global user.email ${USERNAME}@localhost.localdomain
+  && git config --global user.email ${USERNAME}@localhost.localdomain \
+  && git config --global color.ui auto