It failed to reboot during the last upgrade procedure. Upon logging into
the Equinix Metal console, we discovered that we lack access to all 4 of
the servers sponsored by Equinix Metal. They are under the CNCF account,
and it's not possible to transfer them to our organization.

Equinix Metal is being sunset, and the remaining 3 servers will also go
away on June 30th 2026. We can keep them until then, or until they fail
to boot like seoul.mirror.pkgbuild.com.

Extend the role (previously used for ACME DNS verifications only) to
support dynamic DNS functionality planned for sandbox.archlinux.page.

Signed-off-by: Leonidas Spyropoulos <artafinde@archlinux.org>