Make default recordings dir writable also for webserver

Issue bluecherrydvr/bluecherry-apps#620
arises because the dir exists, is owned by bluecherry:bluecherry, but is
by default writable only by owning user, but not the owning group.

Fix this here in docker setup code.
bluecherry-apps code will be amended to handle this, too.

server/entrypoint.sh

@@ -42,6 +42,7 @@ echo "> Writing /etc/bluecherry.conf"
 
 echo "> chown bluecherry:bluecherry /var/lib/bluecherry/recordings"
 chown bluecherry:bluecherry /var/lib/bluecherry/recordings
+chmod ug+rwx /var/lib/bluecherry/recordings
 
 
 # The bluecherry container's Dockerfile sets rsyslog to route the bluecherry