debian-vm-auto-setup/cloud-init_method/cloud-init-config/user-data.yaml

#cloud-config
hostname: sandboxvm
disable_root: false
groups:
  - sandbox
users:
  - name: root
    ssh_authorized_keys: 
      - "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBeNeE0gk6mO0Bz9dDvKQrhA2Oo7x05FicCQJivxqIyi sandbox"
  - name: demo
    passwd: "$6$QQuYYEMEG0bJf7iH$mhFeXl10jSQhFO8ltMAi3CtoGLOz5tPdnEBTcp.4JzS5mnBbpANvm9s.VQFMvWq8nfzgzdDZMGr1hnZLGVd2V." #root
    sudo: ALL=(ALL) NOPASSWD:ALL
    groups: sudo
    shell: /bin/bash
    lock_passwd: false
    ssh_authorized_keys: 
      - "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBeNeE0gk6mO0Bz9dDvKQrhA2Oo7x05FicCQJivxqIyi sandbox"