feat: Jellyfin source external url

[MarS0K]

Please check existing knowledge before opening an issue

• I have checked the documentation
• I have searched through existing issues and discussions.

Describe the new functionality

I'd like to use internal docker network for multi-scrobbler -> jellyfin connection. But now it shows no image in dashboard.

I think it can be done with new configuration parameter externalUrl.

Configuration Example

{
      "type": "jellyfin",
      "name": "MarS0K-Jellyfin",
      "clients": [
        "MarS0K-Lastfm"
      ],
      "data": {
        "url": "http://jellyfin:8096",
        "externalUrl": "https://jellyfin.domain",
        "user": "user",
        "apiKey": "apikey"
      },
      "options": {
        "logPayload": false,
        "logFilterFailure": "debug"
      }
    }

Will you help implement it?

• I am willing to contribute code towards completing this feature
• I am willing to help test preview builds for this feature

[FoxxMD]

Good news! This already exists but it's undocumented because I forgot to add it to the docs 😅

In your example config above, change externalUrl to frontendUrlOverride. That should be all you need to do.

[MarS0K]

It works! Thank you.