set up cronjob and timer

templates/systemd/chill-cronjob@.service

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+[Unit]
+Description=Execute cron job for chill with environment %i
+
+[Service]
+User={{ as_user }}
+ExecStart=/usr/bin/docker compose --file {{ install_dir }}/%i/compose.yaml up cron
+Type=simple
+# execute maximum 30 minutes
+RuntimeMaxSec=1800

templates/systemd/chill-cronjob@.timer

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+[Unit]
+Description=Run chill cron-jobs
+
+[Timer]
+Unit=chill-cronjob@%i.service
+OnCalendar=*-*-* *:0,15,30,45:00
+RandomizedDelaySec=60
+
+[Install]
+WantedBy=multi-user.target