jellyfin: implement the skip intro patch

services/jellyfin.nix

@@ -1,8 +1,27 @@
+{ pkgs, ... }:
+
 {
   services.jellyfin = {
     enable = true;
     openFirewall = true;
     user = "wizardlink";
+    package = pkgs.jellyfin.override {
+      jellyfin-web = pkgs.jellyfin-web.overrideAttrs (
+        final: prev: {
+          installPhase = ''
+            runHook preInstall
+
+            # Inject the skip intro button script.
+            sed -i "s#</head>#<script src=\"configurationpage?name=skip-intro-button.js\"></script></head>#" dist/index.html
+
+            mkdir -p $out/share
+            cp -a dist $out/share/jellyfin-web
+
+            runHook postInstall
+          '';
+        }
+      );
+    };
   };
 
   services.jellyseerr = {