_nginx_ access logs are typically either very small or very large. For
small log files, it's fast enough to decompress them on the fly if
necessary. For large files, they may take up so much space in
uncompressed form that the log volume fills too quickly. In either
case, compressing the files as soon as they are rotated is a good
option, especially since their contents should already be sent to Loki.
The default `logrotate` configuration for _nginx_ may not be appropriate
for high-volume servers. The `nginx_keep_num_logs` variable is now
available to control how many days of logs are kept.
There are a few minor differences between the way Fedora and Buildroot
package *nginx*:
* Fedora uses a user named *nginx* while buildroot uses *www-data*
* Buildroot uses a Debian-like configuration layout (with
`sites-enabled` and `modules-enabled` directories)
This commit adjusts the *nginx* Ansible role to compensate for these
differences, eschewing Buildroot's configuration layout for the one used
by Fedora/Red Hat.
