user-data is now a template with an @SSH_PUBKEY@ placeholder that build-seed.sh fills in from SSH_PUBKEY_FILE, ~/.ssh/id_*.pub or ssh-agent. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Cloud-init seed images
Each operating system has an independent NoCloud configuration and generated
seed.iso:
seediso/
├── debian13/
├── almalinux10/
└── fedora44/
Keeping per-OS metadata separate allows each VM to use a distinct hostname and
cloud-init instance-id. Generated ISO files are ignored by Git and are built
automatically by the corresponding launcher when missing.