Problem 1: package perl-Net-SSLeay-1.88-1.module+el8.3.0+7674+5fd4be5f.x86_64 requires libperl.so.5.

Hi,

Actually, we have a local repo running on Centos - CentOS Linux release 7.9.2009 - synchronized from Oracle repo.
We have a script to do this, here are the commands to do it with Oracle :
reposync --newest-only --delete --download-metadata --repoid=ol8_${ARCH}_${BRANCHE} --download_path=/mnt/miroirs/oracle/OL8/$BRANCHE/$ARCH/  &&  createrepo /mnt/miroirs/oracle/OL8/$BRANCHE/$ARCH/

The versions of the packages :
createrepo-0.9.9-28.el7.noarch
yum-utils-1.1.31-54.el7_8.noarch

ls  repodata/
044cd14d6ecd37692c5511490e4c7568ba0e76fb29e55ba632061f50cf73bc1c-primary.xml.gz      cc0364c91d940d136e0928383e5a9c0a531d3fb2109ba4c09d4f185540ab4123-filelists.sqlite.bz2  repomd.xml