Unable to change the file transfer port

When not using the default port you need to specify the port so the server can properly inform clients about it.

ports:
  - 25570:9987/udp
  - 25571:25571/tcp # you also need to use the same port inside the container
environment:
  - TSSERVER_FILE_TRANSFER_PORT=25571 # this is used to inform clients and to specify the listen port
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