buildx failed with: ERROR: failed to solve: process "/bin/sh -c cd /tmp && tar xf moin-1.9.8.tar.gz && rm moin-1.9.8.tar.gz && cd moin-1.9.8 && iconv -f iso-8859-1 setup.cfg > setup.cfg.new && mv setup.cfg.new setup.cfg && pip install ." did not complete successfully: exit code: 2