release-notes: Add release note about nixos containers directory moves

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

@@ -471,6 +471,28 @@
           new versions will release.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          The configuration and state directories used by
+          <literal>nixos-containers</literal> have been moved from
+          <literal>/etc/containers</literal> and
+          <literal>/var/lib/containers</literal> to
+          <literal>/etc/nixos-containers</literal> and
+          <literal>/var/lib/nixos-containers</literal>.
+        </para>
+        <para>
+          If you are changing <literal>system.stateVersion</literal> to
+          <literal>&quot;22.05&quot;</literal> manually on an existing
+          system you are responsible for migrating these directories
+          yourself.
+        </para>
+        <para>
+          This is to improve compatibility with
+          <literal>libcontainer</literal> based software such as Podman
+          and Skopeo which assumes they have ownership over
+          <literal>/etc/containers</literal>.
+        </para>
+      </listitem>
       <listitem>
         <para>
           <literal>security.klogd</literal> was removed. Logging of

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

@@ -151,6 +151,16 @@ In addition to numerous new and upgraded packages, this release has the followin
   org-contrib, refer to the ones in `pkgs.emacsPackages.elpaPackages` and
   `pkgs.emacsPackages.nongnuPackages` where the new versions will release.
 
+- The configuration and state directories used by `nixos-containers` have been
+  moved from `/etc/containers` and `/var/lib/containers` to
+  `/etc/nixos-containers` and `/var/lib/nixos-containers`.
+
+  If you are changing `system.stateVersion` to `"22.05"` manually on an existing
+  system you are responsible for migrating these directories yourself.
+
+  This is to improve compatibility with `libcontainer` based software such as Podman and Skopeo
+  which assumes they have ownership over `/etc/containers`.
+
 - `security.klogd` was removed.  Logging of kernel messages is handled
   by systemd since Linux 3.5.