external files not tracked by flakes#

due to the required secure nature of these files, we are unable to include thses sets of files/directories in this repository.

• -rw------- /etc/atticd.env: attic credentials file
• -r-------- /etc/lego/desec: acme credentials
• drwx------ /etc/secureboot: secureboot keys
• -r-------- /etc/nitter/guest_accounts.json: nitter guest account tokens