Update job for the run of DOP backend tests

Change-Id: I8e9861ee864da9452d9ece525205f0084c54791a
diff --git a/jenkins/client/job/oss/init.yml b/jenkins/client/job/oss/init.yml
index 9478ffd..5aecb0b 100644
--- a/jenkins/client/job/oss/init.yml
+++ b/jenkins/client/job/oss/init.yml
@@ -1,5 +1,6 @@
 classes:
   - system.jenkins.client.job.oss.test_devops_portal
+  - system.jenkins.client.job.oss.test_devops_portal_backend
   - system.jenkins.client.job.oss.test_devops_portal_nightly
   - system.jenkins.client.job.oss.test_pushkin_codebase
   - system.jenkins.client.job.oss.test_security_monkey_openstack