[dist] Add more features to release notes

ReleaseNotes-2.9

@@ -27,6 +27,10 @@ happen automatically.
 Features
 ========
 
+Generic:
+ * image and container maintenance support, including binary tracking
+ * riscv64 hardware architecture support
+
 Frontend:
  * New Kerberos authentication mode. Read how to setup Kerberos in the OBS Admin Guide: http://openbuildservice.org/help/manuals/obs-admin-guide/
  * New job history page to see why a package was built.
@@ -41,11 +45,37 @@ Frontend:
  * Improved UI/UX for configuration of notifications page. Now it shows a better layout and explanations to make this complex page easy to understand.
  * Allow users to view the full diff of large changes.
  * Remove the unused api_relative_url_root option from the options.yml file.
+ * release mechanism improvements:
+   - manual maintenance release support (avoiding requests)
+   - operation happen atomic for entire project now
+   - support release of single multibuild container
 
 Backend:
  * Support showing source files in blame view (works also via links).
  * Support project copy with makeoriginolder option.
 
+Backend:
+ * New build formats:
+   - native container build based on DockerFile (beside exiting kiwi support)
+   - FISSILE build format
+   - AppImage build format
+ * freezelink command to freeze current sources accessed via project link
+ * support showing source files in blame view (works also via links)
+ * support project copy with makeoriginolder option
+ * support automatic vrev extending via project links
+ * Improved container support:
+   - support build of layered containers by reusing existing contaienrs
+   - support publishing to docker registry server
+   - support container signing via notary server
+ * cloud upload server supporting Amazon EC2 and Microsoft Azure
+ * improved bootstrap cycle handling
+ * additional SHA256 checksum in source commit handling for security
+ * projects can be temporary suspended to avoid scheduling between multiple changes
+ * support AirBrake for reporting problems
+ * support new debian repository format
+ * support for building in openstack cloud
+ * Many smaller improvements in DownloadOnDemand and multibuild handling
+
 Shipment:
  *
 
@@ -83,6 +113,9 @@ Wanted changes:
 
  * _multibuild files have a changed syntax, but OBS stays backward compatible.  Use <flavor> instead of <package> elements in the future.
 
+ * publish hook failures are handled as fatal failures now.
+   => publisher will retry to publish
+
 Other changes
 =============