buildx failed with: ERROR: failed to solve: process "docker-shell ARCH=$(uname -m) && if [ \"$ARCH\" = \"x86_64\" ]; then echo \"Architecture is x86_64\"; ENV ARCH_SPECIFIC_VAR=\"x86_64_v3\"; elif [ \"$ARCH\" = \"aarch64\" ]; then echo \"Architecture is aarch64\"; ENV ARCH_SPECIFIC_VAR=\"aarch64\"; else echo \"Unknown architecture\"; ENV ARCH_SPECIFIC_VAR=\"value_for_unknown\"; fi" did not complete successfully: exit code: 127