Use "every" instead of our own hand-rolled cron

conf/services.d/expire/run

 #!/bin/sh
-
-period=${EXPIRE_PERIOD_SECS:-86400}
-offset=$(shuf -i 0-${period} -n 1)
-
-sleep $offset
-while true; do
-    /usr/local/bin/feedbackloop expire --days=30
-    sleep $period
-done
+exec every ${EXPIRE_PERIOD_SECS:-86400} /usr/local/bin/feedbackloop expire --days=30

conf/services.d/ingest/run

 #!/bin/sh
-
-period=${INGEST_PERIOD_SECS:-3600}
-offset=$(shuf -i 0-${period} -n 1)
-
-sleep $offset
-while true; do
-    /usr/local/bin/feedbackloop ingest
-    sleep $period
-done
+exec every ${INGEST_PERIOD_SECS:-3600} /usr/local/bin/feedbackloop ingest