external-dns v0.22 changed its default annotation prefix to
external-dns.kubernetes.io/ with no fallback. Renovate #129 moved the chart
to 1.23.0 (app v0.23.0), and at 12:13Z it ignored every alpha-prefixed
annotation in this repo: the Gateway target (public names went to A
192.168.2.20), controller: none (jackett, pihole and semaphore got
published), and the L4 Service hostnames (unifi and crafty-mc were deleted).
Set annotationPrefix: external-dns.alpha.kubernetes.io/ to restore the v0.21
reading. Floor the chart at 1.23.0, because the flag needs app >= 0.22.
Co-Authored-By: Claude Opus 5.5 <[email protected]>