add serial console to template

cloudinit/cloud.cfg

@@ -69,7 +69,6 @@ cloud_init_modules:
 
 # The modules that run in the 'config' stage
 cloud_config_modules:
- - emit_upstart
  - ssh-import-id
  - locale
  - set-passwords

debian-bookworm.build.pkr.hcl

@@ -11,4 +11,11 @@ build {
     destination = "/etc/cloud/cloud.cfg.d/99-pve.cfg"
     source      = "cloudinit/99-pve.cfg"
   }
+    provisioner "shell" {
+    inline = [
+      "sed -i -e 's/GRUB_CMDLINE_LINUX=\".*\"/GRUB_CMDLINE_LINUX=\"quiet console=tty0 console=ttyS0,115200\"/' /etc/default/grub",
+      "update-grub",
+      "systemctl enable serial-getty@ttyS0.service"
+    ]
+  }
 }

debian-bookworm.source.pkr.hcl

@@ -28,6 +28,7 @@ source "proxmox-iso" "debian-12-bookworm-cloudinit-template" {
     memory = "2048" 
     cloud_init = true
     cloud_init_storage_pool = "local"
+    serials = ["socket"]
     
     scsi_controller = "virtio-scsi-pci"
     disks {