Lots of improvements and simplifications.

* Collect all logs under the /var/log/koha directory.
* Setup logrotate
* Use a static instance name, leading to simpler configuration.

files/etc/s6-overlay/s6-rc.d/apache2/run

@@ -1,3 +1,7 @@
 #!/command/execlineb -P
 fdmove -c 2 1
-apache2ctl -DFOREGROUND
+
+trap { SIGTERM { apache2ctl stop } 
+       SIGHUP  { apache2ctl graceful } }
+
+apache2ctl -D "FOREGROUND"