rl-2305: Mention woodpecker addition

nixos/doc/manual/release-notes/rl-2305.section.md

@@ -71,6 +71,10 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - [nimdow](https://github.com/avahe-kellenberger/nimdow), a window manager written in Nim, inspired by dwm.
 
+- [woodpecker-agent](https://woodpecker-ci.org/), a simple CI engine with great extensibility. Available as [services.woodpecker-agent](#opt-services.woodpecker-agent.enable).
+
+- [woodpecker-server](https://woodpecker-ci.org/), a simple CI engine with great extensibility. Available as [services.woodpecker-server](#opt-services.woodpecker-server.enable).
+
 ## Backward Incompatibilities {#sec-release-23.05-incompatibilities}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->