warning: mysql-community-libs-compat-8.0.28-1.el7.x86_64.rpm: Header V4 RSA/SHA256 Si                                                                                                         gnature, key ID 3a79bd29: NOKEY
error: Failed dependencies:
        mysql-community-libs(x86-64) >= 8.0.11 is needed by mysql-community-libs-comp                                                                                                         at-8.0.28-1.el7.x86_64
        mariadb-libs is obsoleted by mysql-community-libs-compat-8.0.28-1.el7.x86_64

在安装命令后增加 --nodeps --force 命令

rpm -ivh mysql-community-libs-compat-8.0.28-1.el7.x86_64 --nodeps --force