Add systemd service that automatically bootstraps freshly deployed VMs
with their host-specific NixOS configuration from the flake repository.
Changes:
- hosts/template2/bootstrap.nix: New systemd oneshot service that:
- Runs after cloud-init completes (ensures hostname is set)
- Reads hostname from hostnamectl (set by cloud-init from Terraform)
- Checks network connectivity via HTTPS (curl)
- Runs nixos-rebuild boot with flake URL
- Reboots on success, fails gracefully with clear errors on failure
- hosts/template2/configuration.nix: Configure cloud-init datasource
- Changed from NoCloud to ConfigDrive (used by Proxmox)
- Allows cloud-init to receive config from Proxmox
- hosts/template2/default.nix: Import bootstrap.nix module
- terraform/vms.tf: Add cloud-init disk to VMs
- Configure disks.ide.ide2.cloudinit block
- Removed invalid cloudinit_cdrom_storage parameter
- Enables Proxmox to inject cloud-init configuration
- TODO.md: Mark Phase 3 as completed
This eliminates the manual nixos-rebuild step from the deployment workflow.
VMs now automatically pull and apply their configuration on first boot.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
