No changes in packer snapshot

Hi,

i’m trying to get some basic stuff running with packer against hetzner (hcloud).

After packer build i got an hcloud snapshot from wich i can start a new server.
But no changes that were running during packer build process can be found in it.
(no example.txt, no installed ‘mc’, no changes from ssh.sh script)

What am i doing wrong or am i missing something?

variable "ubuntu_version" {
  type    = string
  default = "20.04"
}

variable "location" {
  type    = string
  default = "nbg1"
}

variable "hcloud_token" {
  type    = string
  default = env("HCLOUD_TOKEN")
}

variable "hcloud_servertype" {
  type    = string
  default = "cpx21"
}

locals {
  ubuntu_version = "${ legacy_isotime("2006-01") }-01"
  build_id = "${ uuidv4() }"
  build_labels = {
    os-flavor               = "ubuntu"
    "ubuntu/iso.release" = "${ local.ubuntu_version }"
    "packer.io/build.id"    = "${ local.build_id }"
    "packer.io/build.time"  = "{{ timestamp }}"
    "packer.io/version"     = "{{ packer_version }}"
  }
}

source "hcloud" "ubuntu-snapshot" {
  server_type  = "${var.hcloud_servertype}"
  image = "ubuntu-${var.ubuntu_version}"
  #image_filter = {
  #  with_selector = [ "os_flavor=debian" ]
  #  most_recent = true
  #}
  rescue       = "linux64"
  location     = var.location  
  snapshot_name = "ubuntu-${var.ubuntu_version}-{{ timestamp }}"
  snapshot_labels = local.build_labels
  ssh_username  = "root"
  token         = "${ var.hcloud_token }"
}

build {
  name    = "ubuntu"
  sources = ["source.hcloud.ubuntu-snapshot"]
  provisioner "shell" {
    script           = "scripts/ssh/ssh.sh"
    environment_vars = [ "SSH_PORT=2222" ]
  }

  provisioner "shell" {
    inline = [
        "echo Adding file to Docker Container",
        "echo \"FOO is $FOO\" > example.txt",
    ]
  }
 
  provisioner "shell" {
    inline = [
        "apt-get update",
        "apt-get install -y mc",
    ]
  }
}