Add headless option and make it default

Author: taylorific

rockylinux/cloud/x86_64/rockylinux-9-x86_64.pkrvars.hcl

@@ -1,3 +1,6 @@
-iso_checksum = "file:https://dl.rockylinux.org/pub/rocky/9/images/x86_64/CHECKSUM"
-iso_url = "https://dl.rockylinux.org/pub/rocky/9/images/x86_64/Rocky-9-GenericCloud-Base.latest.x86_64.qcow2"
-vm_name = "rockylinux-9-x86_64"
+efi_boot          = true
+efi_firmware_code = "/usr/share/OVMF/OVMF_CODE_4M.fd"
+efi_firmware_vars = "/usr/share/OVMF/OVMF_VARS_4M.fd"
+iso_checksum      = "file:https://dl.rockylinux.org/pub/rocky/9/images/x86_64/CHECKSUM"
+iso_url           = "https://dl.rockylinux.org/pub/rocky/9/images/x86_64/Rocky-9-GenericCloud-Base.latest.x86_64.qcow2"
+vm_name           = "rockylinux-9-x86_64"

rockylinux/cloud/x86_64/rockylinux.pkr.hcl

@@ -22,6 +22,11 @@ variable "efi_firmware_vars" {
   default = null
 }
 
+variable "headless" {
+  type    = bool
+  default = true
+}
+
 variable "ssh_username" {
   type    = string
   default = "packer"
@@ -79,6 +84,7 @@ source "qemu" "rockylinux" {
   disk_compression = true
   disk_image       = true
   disk_size        = "32G"
+  headless         = var.headless
   iso_checksum     = var.iso_checksum
   iso_url          = var.iso_url
   machine_type     = "q35"