Add statement about CI for backports
Back in February, the cinder project announced a policy that we'd
like to see CI results documented on driver backports:
Bring this info into the contributor documentation.
@@ -73,3 +73,22 @@ In fact, maybe *too* easy. Here are some guidelines:
If you have questions about any of this, or if you have a bug to fix that
is only present in one of the stable branches, ask for advice in
``#openstack-cinder`` on IRC.
+
+Backport CI Testing
+-------------------
+
+Like all code changes, backports should undergo continuous integration
+testing. This is done automatically by Zuul for changes that affect the
+main cinder code.
+
+ When a vendor driver patch backport is proposed, we would like to
+ see a clear statement on the gerrit review that the patch has been
+ tested in an appropriate environment.
+
+This shouldn't be a big deal because presumably you've done local
+testing with your backend to ensure that the code works as expected in a
+stable branch; we're simply asking that this be documented on the backport.
+
+A good example of how to document this can be found on
+`https://review.opendev.org/c/openstack/cinder/+/821893/
+<https://review.opendev.org/c/openstack/cinder/+/821893/3#message-ade9aa6ad8bd99fefab908c777fe106e907c7636>`_.
