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PS: I also had some socket exception when running wine reg ADD, that went away by using the same "&& wineserver -w" trick at the end of the command.
I think you can do away with the /tmp/bin/waitfor.sh script by using wineserver -w instead. It seems to work for me.
Having said that, thank you so much for providing this Dockerfile! I would have never thought that Wine leaves some background processes running during winecfg, which get stomped over by Docker...