nixos/doc/rl-2205: Add `postgresqlTestHook`

nixos/doc/manual/from_md/release-notes/rl-2205.section.xml

@@ -73,6 +73,13 @@
           Systemd has been upgraded to the version 250.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          The new
+          <link xlink:href="https://nixos.org/manual/nixpkgs/stable/#sec-postgresqlTestHook"><literal>postgresqlTestHook</literal></link>
+          runs a PostgreSQL server for the duration of package checks.
+        </para>
+      </listitem>
       <listitem>
         <para>
           <link xlink:href="https://kops.sigs.k8s.io"><literal>kops</literal></link>

nixos/doc/manual/release-notes/rl-2205.section.md

@@ -27,6 +27,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - Systemd has been upgraded to the version 250.
 
+- The new [`postgresqlTestHook`](https://nixos.org/manual/nixpkgs/stable/#sec-postgresqlTestHook) runs a PostgreSQL server for the duration of package checks.
+
 - [`kops`](https://kops.sigs.k8s.io) defaults to 1.22.4, which will enable [Instance Metadata Service Version 2](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html) and require tokens on new clusters with Kubernetes 1.22. This will increase security by default, but may break some types of workloads. See the [release notes](https://kops.sigs.k8s.io/releases/1.22-notes/) for details.
 
 - Module authors can use `mkRenamedOptionModuleWith` to automate the deprecation cycle without annoying out-of-tree module authors and their users.