add ENABLE_BACKUPS label

.env.sample

@@ -2,6 +2,7 @@ TYPE=zammad
 
 DOMAIN=zammad.example.com
 TIMEOUT=600
+ENABLE_BACKUPS=true
 
 ## Domain aliases
 #EXTRA_DOMAINS=', `www.zammad.example.com`'

compose.yml

@@ -149,7 +149,7 @@ services:
       restart_policy:
         condition: on-failure
       labels:
-        backupbot.backup: "true"
+        backupbot.backup: "${ENABLE_BACKUPS:-true}"
         backupbot.backup.pre-hook: "/pg_backup.sh backup"
         backupbot.backup.volumes.postgresql-data.path: "backup.sql"
         backupbot.restore.post-hook: '/pg_backup.sh restore'