chore: prepare release 0.12.0

Signed-off-by: Lars Wirzenius <liw@liw.fi>

NEWS.md

@@ -4,6 +4,52 @@ This file summarizes the user-visible changes to `radicle-ci-broker`
 between releases.
 
 
+## Version 0.12.0, released 2025-01-29
+
+Breaking changes:
+
+* The `radicle_ci_broker::msg::helper` module error type has been
+  renames to `MessageHelperError` from `NativeMessageError`. The old
+  name was misleading and copy-pasted from the Radicle native CI
+  adapter.
+
+* The `radicle_ci_broker::db::Db::queued_events` method has been
+  dropped. This also means the CI broker no longer checks that the old
+  "broker events" queue is empty when starting. Previously `cib` would
+  refuse to start if the old queue wasn't empty. (The new queue has
+  "CI events", which are different from "broker events". This change
+  only affects the old queue, which hasn't been used in several
+  releases.)
+
+New features:
+
+* There is now a new way to specify when a CI run should trigger,
+  using the new `triggers` field in the configuration file. The new
+  approach allows many runs to be triggered from one change, and each
+  run can have a different CI adapter. See the user guide chapter
+  "Triggering CI" for details. The old `filter` and `default_adapter`
+  approach is still supported, but will eventually go away.
+
+* As part of the `triggers` change, because of old mistakes, filtering
+  of event now happens when queued events are processed. Previously,
+  the filter was applied before an event was queued. This will
+  hopefully not cause problems due to the event queue exploding in
+  size. If it does cause problems, we can fix that, although it'll
+  require a database schema change. Let us know.
+
+* The `cibtool trigger` option `--ref` (also known as `--name`) now
+  defaults to `main` and `--commit` defaults to `HEAD`. This makes the
+  command a little bit more convenient to use.
+
+* The frequency of how often the event queue length is logged can now
+  be configured. This reduces log spam when the CI broker is idle. The
+  setting is called `queue_len_interval` and is set to one hour by
+  default.
+
+* The source code repository for the CI broker now includes packaging
+  for the NixOS operating system.
+
+
 ## Version 0.11.1, released 2025-01-09
 
 This is primarily a bug fix release.