Anonymous server access

[widberg]

Is there any way to enable the -anonymous option on the server in the container? I can't seem to find a way to do it. The way the server accepts options is annoying since it requires editing the server.conf file (server.conf#L158-L162). I don't want to build a new image to change one option but I do otherwise love the convenience of using this docker image. Thank you for maintaining this.