chore(docs): add compose for db backup

docker/compose/db-backup.yml

@@ -0,0 +1,24 @@
+services:
+  rclone-backup:
+    image: ghcr.io/bhunter234/rclone-backup # for postgres 16 use ghcr.io/adrienpoupa/rclone-backup
+    container_name: rclone-backup
+    environment:
+      - RCLONE_REMOTE_NAME=remote # use any rclone remote to backup db file  gdrive is recommended
+      - BACKUP_KEEP_DAYS=10
+      - CRON=0 */6 * * * # backup file every 6 hours
+      - ZIP_ENABLE=true
+      - DB_TYPE=postgresql
+      - PG_HOST=postgres
+      - PG_DBNAME=postgres
+      - PG_USERNAME=user
+      - PG_PASSWORD=pass
+      - ZIP_PASSWORD=zippass
+    restart: always
+    networks:
+     - postgres
+    volumes:
+      - /path/to/rclone/configdir/:/config/rclone
+
+networks:
+  postgres:                                 
+    external: true