Release notes 1.23

Fixes: https://pagure.io/koji/issue/2446

docs/source/migrations/migrating_to_1.23.rst

@@ -0,0 +1,24 @@
+Migrating to Koji 1.23
+======================
+
+You should consider the following changes when migrating to 1.23:
+
+DB Updates
+----------
+
+There is one minor schema change in this release. We've dropped NOT NULL
+restriction on tag_extra value column to allow block these values in hierarchy
+(`PR#2495 <https://pagure.io/koji/pull-request/2495>`_).
+
+As in previous releases, we provide a migration script that updates the database.
+
+::
+
+    # psql koji koji < /usr/share/doc/koji/docs/schema-upgrade-1.22-1.23.sql
+
+
+Other changes
+-------------
+
+There are numerous other changes in 1.23 that should not have a direct impact on migration. For
+details see: :doc:`../release_notes/release_notes_1.23`

docs/source/migrations/migrations.rst

@@ -5,6 +5,7 @@ Migrations
 .. toctree::
     :maxdepth: 1
 
+    migrating_to_1.23
     migrating_to_1.22
     migrating_to_1.21
     migrating_to_1.20