[InterNetNews/inn] 1570cc: Do not bail when a FQDN is not found

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 1570ccd3e53ff0e78466c3fe5e0eea493691ee5d
      https://github.com/InterNetNews/inn/commit/1570ccd3e53ff0e78466c3fe5e0eea493691ee5d
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2024-09-29 (Sun, 29 Sep 2024)

  Changed paths:
    M doc/pod/inn.conf.pod
    M doc/pod/libinn.pod
    M doc/pod/news.pod
    M include/inn/paths.h.in
    M lib/Makefile
    M lib/getfqdn.c
    M lib/innconf.c

  Log Message:
  -----------
  Do not bail when a FQDN is not found

Improve how the check works at startup:

- recognize an INN_HOSTNAME environment variable that, when set and
fully qualified, is taken by INN as the hostname;

- make non-fatal the check for a fully qualified hostname.  This way,
the warning appears in the logs, and the news admin will see it and
can take appropriate actions.  The installation of INN will no longer
fail when using the Debian package (and probably also from other
distributions) on Docker.

The second point is normally enough to solve the issue of this ticket.
The environment variable permits silencing the warning.

close #311



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