Rotate DigitalOcean droplet snapshots every 48 hours, keeping four

### What this workflow does 1. Runs every 48 hours: The workflow is triggered by a cron node that runs every 48 hours, ensuring timely snapshot management. 2. List all droplets: The workflow retrieves all droplets in the DigitalOcean account. 3. Retrieve snapshots: For each droplet, the workflow retrieves a list of existing snapshots. 4. Filter snapshots: If the number of snapshots exceeds 4, the workflow filters for snapshots that need to be deleted. 5. Delete snapshots: Excess snapshots are automatically deleted based on the filter criteria. 6. Create new snapshot: After cleaning up, the workflow creates a new snapshot for each droplet, ensuring that backups are always up-to-date.