[BUG] somehow wants to use a specific git-account to build this project

=> ERROR [xpra 10/31] RUN cd /opt/xpra-html5 &&     git config --global user.email "selkies@docker" &&     git config --global user.name "Selkies Builder" &&     git init && git checkout -b selkies-build-patches &&     git add . && git commit -m "selkies-build-patches" &&     python3.6 ./set  0.3