Instalar Apt en Ubuntu
FROM centos:8
RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-* &&\
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-Linux-*
#docker
RUN yum upgrade -y
#other commands
conjunction cell