fix: replace deprecated mysql backup image with modern cron backup container

- The 'databack/mysql-backup' image crashes immediately when used in a pure cron context without legacy arguments and is incompatible with MySQL 8 caching_sha2_password.

- Switched to the actively maintained 'fradelg/mysql-cron-backup' image.

- Re-mapped environment variables to match the new image expectations (MYSQL_HOST, CRON_TIME, MAX_BACKUPS).

- Updated volume mapping destination to '/backup' as expected by the new image.

docker-compose.yml

@@ -44,15 +44,17 @@ services:
       - fasto-net
 
   backup-mysql:
-    image: databack/mysql-backup
+    image: fradelg/mysql-cron-backup
+    restart: always
     environment:
-      DB_SERVER: db
-      DB_USER: root
-      DB_PASS: ${DB_PASSWORD:-root_password}
-      DB_DUMP_CRON: "55 2 * * *" # Roda todo dia exatamente às 02:55 da manhã
-      DB_CLEANUP_TIME: 4320 # Apaga os locais mais velhos que 3 dias
+      MYSQL_HOST: db
+      MYSQL_USER: root
+      MYSQL_PASS: ${DB_PASSWORD:-root_password}
+      CRON_TIME: "55 2 * * *" # Roda todo dia exatamente às 02:55 da manhã
+      MAX_BACKUPS: 3 # Mantém apenas os 3 últimos dias
+      INIT_BACKUP: "1" # Faz um backup imediatamente ao ligar o container
     volumes:
-      - /opt/backups_db:/db
+      - /opt/backups_db:/backup
     networks:
       - fasto-net