Closes#512.
The previous `(block_actuator)` snippet emitted `respond @actuator 404`
at the top level of each archive vhost. But each vhost also has a
catch-all `handle { reverse_proxy ... }` that matches /actuator/*
too. Caddy's `handle` blocks are mutually exclusive — once one matches,
the request never reaches a top-level `respond`. So /actuator/health
was being proxied to the backend, which 302s to /login.
Wrap the actuator response in its own `handle /actuator/*` block.
Caddy sorts `handle` blocks by path specificity, so /actuator/* wins
over the catch-all and the 404 is actually returned.
Verified with `caddy validate` against the caddy:2 image.
Also unblocks the nightly.yml smoke test's `/actuator/health → 404`
assertion, which has been failing since the first staging deploy.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
