The Unifi Network server writes a bunch of log files that we need to
forward to Victoria Logs. This commit introduces components to the
Fluent Bit pipeline to read these files with the `tail` input plugin,
parse them using regular expressions to extract the correct time stamp
from the messages, and send them to Victoria Logs.
The linuxserver.io Unifi container stored Unifi server and device logs
under `/var/lib/unifi/logs`, while the new container stores them under
`/var/log/unifi`.
The UniFi controller can act as a syslog server, receiving log messages
from managed devices and writing them to files in the `logs/remote`
directory under the application data directory. We can scrape these
logs, in addition to the logs created by the UniFi server itself, with
Promtail to get more information about what's happening on the network.
