project_id        = "your-gcp-project-id"
region            = "us-central1"
zone              = "us-central1-a"
instance_name     = "data-engineering-vm"
machine_type      = "e2-medium"
disk_size_gb      = 50
ssh_username      = "debian"
ssh_pub_key_path  = "~/.ssh/id_rsa.pub"