The responder introspects authelia over https by name. It had no CA trust
at all, so the handshake failed UnknownIssuer, introspection failed, and it
denied every client -- surfacing at the controller as a 60s
authorization-violation loop, two layers from the cause.
Adds a shared trustBundle helper to lib/hive-ca-trust.nix rather than a
fifth hand-rolled concat. Four containers were each assembling this
themselves, which is how they came to share one defect: wantedBy + before
express ordering but not success, so a failed assembly let the consumer
start against a missing file and trust nothing at all.
The helper fixes both halves of that. requires goes on the consumer, so a
failed bundle stops it and the dependency is visible in systemctl status
where someone debugging a TLS failure looks. And the script assembles to a
temp path, checks the result actually contains a certificate, and only then
moves it into place -- cat of an empty bind exits 0, so set -e does not
catch it and a partial bundle must never appear under the final name.
Returns a module rather than bare services: a caller that already writes
systemd.services.<consumer> cannot also write systemd.services in the same
attrset.