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$ packer version
Packer v1.5.5

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$ tree
.
├── README.md
├── build.pkr.hcl
├── sources.pkr.hcl
└── variable.pkr.hcl

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variable "image_nginx" {
  type    = string
  default = "nginx:latest"
}

variable "image_php-fpm" {
  type    = string
  default = "php:7.3-fpm"
}

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/*
{
  "type": "docker",
  "image": "nginx:latest",
  "commit": true
}
*/
source "docker" "nginx" {
  image  = var.image_nginx
  commit = true
}

/*
{
  "type": "docker",
  "image": "php:7.3-fpm",
  "commit": true
}
*/
source "docker" "php-fpm" {
  image  = var.image_php-fpm
  commit = true
}

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build {
  sources = [
    "source.docker.nginx",
    "source.docker.php-fpm"
  ]

  provisioner "shell" {
    inline = [
      "hostname && cat /etc/os-release"
    ]
  }
}

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$ packer build ./