有没有可能跳过构建步骤来触发Packer的后处理器？

{
  "builders": [
    {
      "type": "amazon-ebs",
      "region": "us-west-2",
      "source_ami": "ami-12345678",
      "instance_type": "t2.micro",
      "ssh_username": "ubuntu"
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "script": "install.sh"
    }
  ],
  "post-processors": [
    {
      "type": "shell-local",
      "command": "echo 'Post-processing step'"
    }
  ],
  "post-processors": [
    {
      "type": "shell-local",
      "command": "echo 'Post-processing step'"
    }
  ],
  "post-processors": [
    {
      "type": "shell-local",
      "command": "echo 'Post-processing step'"
    }
  ],
  "post-processors": [
    {
      "type": "shell-local",
      "command": "echo 'Post-processing step'"
    }
  ]
}