feat(cron): add cron to container

cron is installed with supervisor managing the process

!1

includes/etc/supervisor/conf.d/cron.conf

@@ -0,0 +1,8 @@
+[program:cron]
+startsecs=0
+stopwaitsecs=55
+autostart=true
+autorestart=true
+stdout_logfile=/var/log/supervisor/%(program_name)s.log
+stderr_logfile=/var/log/supervisor/%(program_name)s.log
+command=/usr/sbin/cron -f