Describe the bug
Images added on the extra configuration key are not displayed. This is my configuration:

{
  "refresh_interval": "0 */10 * * * *",
  "images": {
    "exclude": ["jellyfin/jellyfin"],
    "extra": [
      "umamisoftware/umami:postgresql-v2.17.0"
    ]
  }
}

But the image is not being monitored or showing up on different section or something

System info (please complete the following information):

• OS: Ubuntu (Docker)
• Cup version: 3.2.0