ops: cut postgres backup retention from 7 to 3 days

Author: ryanwaits

docker/scripts/backup-postgres.sh

@@ -9,7 +9,7 @@ BACKUP_DIR="${DATA_DIR}/backups/postgres"
 CONTAINER="${PG_CONTAINER:-secondlayer-postgres-1}"
 PG_USER="${PG_USER:-secondlayer}"
 PG_DB="${PG_DB:-secondlayer}"
-RETENTION_DAYS=7
+RETENTION_DAYS=3
 DATE=$(date +%Y%m%d-%H%M%S)
 
 log() { echo "[$(date -Iseconds)] $*"; }