docs: add docker recurring backup examples

examples/docker-compose.scheduled.local.yaml

@@ -3,12 +3,14 @@ services:
   pg-bkup:
     image: jkaninda/pg-bkup
     container_name: pg-bkup
-    command: backup --dbname database_name
+    command: backup --dbname database_name #--cron-expression "@every 5m"
     volumes:
       - ./backup:/backup
     environment:
       - DB_PORT=5432
-      - DB_HOST=postgress
+      - DB_HOST=postgres
       - DB_USERNAME=userName
       - DB_PASSWORD=${DB_PASSWORD}
-      - BACKUP_CRON_EXPRESSION=0 1 * * *
+      # Check https://jkaninda.github.io/pg-bkup/reference/#predefined-schedules
+      - BACKUP_CRON_EXPRESSION=@daily #@every 5m|@weekly | @monthly |0 1 * * *
+