feat: backup labels for mysql

compose.yml

@@ -59,6 +59,12 @@ services:
       - "mariadb:/var/lib/mysql"
     networks:
       - internal
+    deploy:
+      labels:
+          backupbot.backup: "true"
+          backupbot.backup.pre-hook: 'mkdir -p /tmp/backup/ && mysqldump --single-transaction -u root -p"$$(cat /run/secrets/db_root_password)" keycloak > /tmp/backup/backup.sql'
+          backupbot.backup.post-hook: "rm -rf /tmp/backup"
+          backupbot.backup.path: "/tmp/backup/"
 
 networks:
   internal: