For pure factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jayvdb:branches:devel:languages:perl/pure_factory/home:jayvdb:branches:devel:languages:perl.repo
zypper refresh
zypper install perl-CPAN-Mini
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jayvdb:branches:devel:languages:perl/openSUSE_Tumbleweed/home:jayvdb:branches:devel:languages:perl.repo
zypper refresh
zypper install perl-CPAN-Mini