balg02: Initial implementation of Guix build farm

* .guix/guix-na/config/balg02.scm (%automation-user): Removed variable (only used in one place).
(%cuirass-specs): New variable. (Initial) Cuirass specifications that are run by the guix-na build farm.
(publish-robots.txt): New variable. Used in nginx configuration.
(publish-locations): New function. Defines nginx publish locations (used for http and https servers).
(balg02-locations): New function. Defines nginx publish locations used for guix-na.
(%publish-url): New variable. String representing local publish URL.
(%tls-settings): New variable. Captures nginx tls settings used in nginx configuration.
(le): New function. Generates lets encrypt path given a host and optionally a private key.
(languages-to-accept): New variable. Languages for i8ln.
(accept-languages): New function.
(%balg02-servers): New variable. balg02 nginx servers.
(%extra-content): New variable. Extra nginx configuration content.
(%nginx-configuration): New variable. Capture nginx configuration given all previous helper
functions and variables.
(%nginx-cache-activation): New variable. Service the ensures /var/cache/nginx exists on the
first run.
(%nginx-deploy-hook): New variable. Hook used upon cerbot certificate updates.
(balg02 (packages)): Add btrfs-progs.
(balg02): Remove root ssh key (not necessary as ssh root login is disabled).
(balg02 (services)): Add cuirass, certbot, nginx, and guix-publish services.

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