* mirror: Add architecture filter to RepoMirrorConfig (PROJQUAY-10255)
Adds architecture_filter field to filter multi-arch images during mirroring.
Supports amd64, arm64, ppc64le, s390x, 386, and riscv64 architectures.
Empty/null value mirrors all architectures (backwards compatible).
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* shrink valid arches for repo mirroring to only the necessary ones
* run formatter on file
* fix unit test
* validate arch before setting
---------
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>