clear cloud backups before generating more

roles/cloud-backups/templates/backup-to-b2.sh.j2

@@ -3,6 +3,8 @@
 
 LOG_FILE="/var/log/rclone/rclone-$(date +%Y-%m-%d).log"
 
+rm -f /opt/backups/*
+
 {% if backups is defined and 'containers' in backups %}
 {% if containers is defined %}
 {% for container in containers %}