op-build v1.22 release notes

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/doc/release-notes/index.rst b/doc/release-notes/index.rst
index 8a2e32d..7de1bce 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -12,3 +12,4 @@
    v1.21.1
    v1.21.2
    v1.22-rc1
+   v1.22