Valheim Modded (Docker) server fails to install — stuck after verifying update

<img width="1588" height="508" alt="Image" src="https://github.com/user-attachments/assets/7ec6fa1d-2870-4d42-8224-e521111b3e09" />

When deploying the Valheim modded server template via Docker, the installation fails after SteamCMD finishes downloading the base game. The container starts but does not complete installation, ending with Failed to install server.
