ccp.runtimes.lxd/focal-fossa/packer.json

{
	"builders": [
	    {
        	"type": "lxd",
        	"name": "{{ user `name`}}",
        	"image": "ubuntu:20.04",
        	"output_image": "{{ user `name` }}",
        	"publish_properties": {
          		"description": "{{ user `description`}}"
 		}
      	   }
    ],
    "provisioners": [],
    "post-processors": []
}