add backup support

compose.yml

@@ -97,6 +97,9 @@ services:
         - "traefik.http.routers.${STACK_NAME}.tls.certresolver=${LETS_ENCRYPT_ENV}"
         - "traefik.http.routers.${STACK_NAME}.entrypoints=web-secure"
         - "coop-cloud.${STACK_NAME}.version=3.2.1+2024.06.66"
+        - "backupbot.backup=${ENABLE_BACKUPS:-true}"
+        - "backupbot.backup.volumes.traefik_letsencrypt=false"
+        - "backupbot.backup.volumes.mailu.path=backup"
   
   db:
     image: redis:8.10.2-alpine
@@ -115,6 +118,13 @@ services:
       - "mailu:/data"
     networks:
       - default
+    configs:
+      - source: backup_sqlite
+        target: /usr/local/bin/backup_sqlite.py
+        mode: 0444
+    deploy:
+      labels:
+        backupbot.backup.pre-hook: "python3 /usr/local/bin/backup_sqlite.py"
 
   imap:
     image: ghcr.io/mailu/dovecot:2024.06.66
@@ -221,6 +231,10 @@ configs:
   certdumper_post:
     name: ${STACK_NAME}_certdumper_post_${CERTDUMPER_POST_VERSION}
     file: certdumper_post.sh
+  backup_sqlite:
+    name: ${STACK_NAME}_backup_sqlite_${BACKUP_SQLITE_VERSION}
+    file: backup_sqlite.py
+
 
 secrets:
   secret_key: