Mock Core Configs changes
- The bootstrap chroot feature has been disabled for fedora-riscv64 chroots, as it is not currently
functional on this architecture.
- Fix aarch64 configuration for Azure Linux 3 (copy & paste error).
- The EOL configuration for epel-6 has been updated with a bug fix for CA
certificate trust, ensuring the chroot trusts the same set of CAs as the host.
- Added RISC-V 64-bit architecture support with new configuration files for
Fedora 42 and 43. The configs use the RISC-V Koji infrastructure at
riscv-koji.fedoraproject.org.