[VOL-5004] - Clone unit tests to run on a v2.12 branch

[VOL-5007]
[VOL-5010]

howto/release/preparation.rst
howto/release/ci-management/index.rst
howto/release/ci-management/create_lts_view.rst
-----------------------------------------------
  o Document new makefile targets added to help branch jenkins
  o jobs for release.

Change-Id: I79b27cb16a11c76417d5f6fc2458e4c2d1bee2e0
diff --git a/howto/release/index.rst b/howto/release/index.rst
index 29e1002..6dfa10f 100644
--- a/howto/release/index.rst
+++ b/howto/release/index.rst
@@ -4,6 +4,7 @@
 .. toctree::
    :maxdepth: 1
 
+   preparation
    release-notes
 
    ci-management/index