gitea.kosmos.org/packer/custom.json

{
  "builders": [{
    "type": "docker",
    "image": "busybox",
    "run_command": ["-d", "-i", "-t", "{{.Image}}", "/bin/sh"],
    "commit": true
  }],
  "provisioners": [
    {
      "inline": ["mkdir /custom"],
      "type": "shell"
    },
    {
      "type": "file",
      "source": "../custom/",
      "destination": "/custom"
    }
  ],
  "post-processors": [
    [
      {
        "type": "docker-tag",
        "repository": "eu.gcr.io/fluted-magpie-218106/gitea_custom",
        "tag": "0.1.2"
      },
      "docker-push"
    ]
  ]
}