ARG architecture=amd64 FROM $architecture/centos:7 LABEL com.example.version="0.2.1-beta" ARG architecture ENV INTERESTING_PATH /usr/bin/interesting-software COPY entrypoint.sh /usr/bin/entrypoint.sh RUN if [ "$architecture" = "i386" ]; then echo "Building i386 docker image" && \  linux32 yum update -y && linux32 yum install -y mysql ; \  else yum update -y && yum install -y mysql EXPOSE 80/tcp VOLUME [/var/lib/mysql/data] ENTRYPOINT ["/usr/bin/entrypoint.sh"]