install chi-node-12, possible as a runner-only box like chi-node-14

a xmas gift for my friends in the network team, but sssh don't tell them, it's a serkit!

checklist:

• bootstrap grml
• fabric install (in progress)
• test RAM (with memtester? proprietary memtest86?)
• fix serial console?

new-machine checklist:

• partitions
• debian install and security upgrades
• hostname
• public IP
• reverse DNS
• working resolver
• root password reset

Post install checklist:

• add to spreadsheet
• tsa-misc
• bootstrap puppet
• add to nagios
• reboot
• dnswl (N/A)
• mandos
• ganeti install
• iSCSI cluster config
• gitlab runner(s) config