ombi keeps its Servarr connections in its own database, so the mesh has no
file to write them into. A run-once step reads the three bindings and pair
credentials and writes host, port, TLS, base path and key into ombi through
ombi's own API - only when they differ, and nothing else ombi keeps.
Until the operator accepts an app's key for this pair the mesh delivers a
value it minted, which no Servarr app accepts. The step tries the key against
the app first and, refused, writes nothing and fails naming the secret accept
that fixes it, so the old working key in ombi is never replaced by a dead one.
Declared last so its failing gates nothing else of ombi (ADR 0136), and
restart-on its six inputs so it runs again when a provider moves (ADR 0099).
