fix: always pull newest jellyfin version.

Test/test.sh

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+JELLYFIN=jellyfin/jellyfin
+
 set -eu
 cd "$(dirname "$0")"
 pwd
@@ -10,9 +12,10 @@ pwd
 pwd
 mkdir -p ./cache ./media ./config/plugins/jellyfin-smart-playlist
 cp ../Jellyfin.Plugin.SmartPlaylist/bin/Debug/net8.0/jellyfin-smart-playlist.dll ./config/plugins/jellyfin-smart-playlist/
+docker pull "$JELLYFIN"
 docker run --rm --user "$(id -u):$(id -g)" \
     -v ./cache:/cache \
     -v ./config:/config \
     -v ./media:/media \
     -p 8096:8096 \
-    jellyfin/jellyfin
+    "$JELLYFIN"