rpmbuilder publishes vendored third-party RPMs (vault, consul, helm, ...)
which currently go to Gitea's RPM registry. Move them onto artifactapi so
they live in real yum repos alongside rpm-internal, and keep vendored
packages separate from in-house software. rpmbuilder targets EL8, EL9 and
Fedora 42/43/44, so each distro gets its own repo to avoid EL/Fedora RPMs
colliding in a single repodata set.
- Add config/local_rpm/rpm-vendor-el8.yaml
- Add config/local_rpm/rpm-vendor-el9.yaml
- Add config/local_rpm/rpm-vendor-f42.yaml
- Add config/local_rpm/rpm-vendor-f43.yaml
- Add config/local_rpm/rpm-vendor-f44.yaml
config.hcl already globs local_rpm/*.yaml, so no wiring change is needed.