このコマンドを追加すれば良い
sudo yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
例
FROM amazonlinux:2 RUN yum update -y \ && yum clean all \ && sudo yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
参考
Turn on EPEL repository for EC2 instances that run CentOS, RHEL, or Amazon Linux | AWS re:Post