Install the add-on arch-slk like so:
$ cd ${SPDIR}/configure_scripts
$ ./config.sh -s dkrz-mistral -a arch-slk
This will create the directories ${SPDIR}/chain/gcm2icon/sp001_arch-slk and ${SPDIR}/chain/icon2icon/sp002_arch-slk including the basic scripts in the directory scripts and the directory scripts_arch-slk containing the the settings arch-slk_settings and the run script arch-slk.job.sh.
Edit the file arch-slk_settings. The meanings for the environment variables are listed here.