ff07c07608
Caddy hostnames can begin with http:// to disable automatic HTTPS.
The default value for services.caddy.<host>.logFormat puts the hostname
in the log filename, resulting in a broken path. Similarly, multiple
space-separated host names would not work before.
Since version 2.9.0 (commit 7c52e7a), caddy fails to start if it cannot
open the log file. This caused NixOS test failures (e.g.,
nixosTests.dokuwiki).