Refactor Debian 13 Trixie Packer templates for LUKS support

- Removed obsolete variable files: variables-common.pkr.hcl and variables.pkr.hcl.
- Updated debian-trixie.pkr.hcl to include local values for LUKS configuration.
- Modified boot command to include LUKS arguments based on the enable_luks variable.
- Enhanced initial-setup.sh to support LUKS detection and resizing.
- Replaced preseed.cfg with preseed.cfg.pkrtpl for dynamic LUKS configuration.
- Added enable_luks variable to control LUKS encryption during image build.
- Introduced luks.pkrvars.hcl for LUKS-specific variable settings.
- Updated mise.toml to support new variable file argument for Packer builds.

debian/13-trixie/variables.pkr.hcl

@@ -59,7 +59,11 @@ variable "install_finished_inform_port" {
   description = "The server port to inform when installation is finished"
 }
 
-
+variable "enable_luks" {
+  type        = bool
+  default     = false
+  description = "Build Debian with LUKS encrypted root storage."
+}
 
 # local values
 local "timestamp" {